First of all (it is actually very simple 
).
just connect your second router to your modem and see which ip address the modem assigns to the second router.
Edit the modem and reserve that ip address to that router, but do this in the modem.
(i will assume in this case for the story it is 192.168.178.10
a small explanation about static ip addresses (or preserved or permanent as each router names this differently) and the dhcp server.
normally we assign a static ip address outside the DHCP spool (this is the range of ip addresses which are reserved for the dhcp server . so if the lan network is 192.168.178.1/24 and the dhcp spool starts at 192.168.178.10 and has 50 addresses then the spool is from 192.168.178.10 to 192.168.178.59 which are 50 addresses.).
however if we let a router (in this case the ziggo modem) assign a static address to a local device (in this case the second router) it does not matter if that address is inside or outside the dhcp spool as long as it is inside the 192.168.178.1/24 network. (192.168.178.1/24 means a subnetmask of 255.255.255.0 with 255 addresses including it`s own. as 192.168.xxx.xxx is a class C network it standard has a subnetmask of 255 addresses fyi).
why does this not matter? because it knows that that specific address is assigned and will not hand it out to another device (mac-address).
But if we set up a device to be static in a network outside the router.
So as it is explained in the first post in this topic.
Then off course it needs to be outside the DHCP spool of the router to which it is connected
but within it`s LAN ip range (in this case the LAN range of the modem which is 192.168.178.1/24) in order to make sure that the dhcp server of that router does not hand out that same ip address to an other device.
Back to the begin.
the second router is now connected to the ziggo-modem and has a IP address from the dhcp server off the ziggo-modem which you made static in the ziggo-modem.
Now you connect your devices to the second router and make sure no device has it`s ip settings static in their device. So all devices are set to receive their ip address from the dhcp server (in this case from the second router).
In windows type in the "run” button the command ncpa.cpl
this will open your network devices off the computer.
find the one which you connect with to the router and click on it with the right mouse button.
then in that roll down menu click with the left mouse button on the word "status”
then in the window that opens click again on "details” this should list the received ip address of that windows pc but also it`s ipv4 standard gateway (this is the routers LAN ip address).
let`s assume this is 192.168.0.1 (it can literally be any other address).
now in your browser on your pc enter in the address field that ip address 192.168.0.1
and if all is well we will now see the login page of the router.
in here you should be able to find the Pi-server in the dhcp client-list (or under connected devices which ever it is called).
assign a static ip address to that PI device as you did earlier but now you do this in this router for the Pi device.
after you have done this go to port forwarding and add a rule.
set at the ip address the ip address of the Pi device,
set as local start port, port 80 (if that is the port you need to enter the pi device but i assume it is)
if asked set as local end port also the same port which is in this case port 80.
set as external start port any port you want but not port 80 or 443 or any other tcp and udp port that is preserved. for a Overview of common TCP and UDP Default Ports click on this link.
let`s assume you choose port 1212.
then fill in at external start port 1212 and do the same with external end port if prompted.
then choose protocol (choose both if you are in doubt )
lastly activate or enable the rule (mostly you need to vink that option)
and apply.
now open a second tab in your browser and in the address field type 192.168.178.1
and login to your ziggo modem.
in here go to port forwarding and add a rule.
fill in that rule ip address 192.168.178.10 (which is the Wan-ip address off your second router)
at the local start port you fill in 1212 and do the same at the local end point if asked.
at the external start port again any port (except the ones listed in the earlier link) is okay,
let`s take 1111 fill this in also at the external end port when prompted.
vink on activate or enabled and apply the rule.
before everything works you need to restart the router if you gave the
Pi device an other static ip address then it also was given by the routers dhcp server.
in order to make sure the pi device has the ip address you assigned to it.
however if that was the same it received from the router already then no restart is necessary.
no open a new tab in your browser and go to www.whatismyip.com and see what your Ipv4 is that the provider assigned to your ziggo modem.
copy that address and fill it in on the browsers address field but add a double point and the port 1111. for instance your ipv4 is 85.86.52.86 then in the address field fill in 85.86.52.86:1111
now you should be able to enter you Pi server from outside your local area network.
hope it helps if you still haven`t found a solution.
Greets
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