hotspot paypal verification

So I have another router which is just a hotspot, it’s a 750, I have two questions:

First off, I’ve got radius and user-manager running on the 750. The hotspot is configured, except I cannot see the signup option for new users, I’ve configured my customer account with a public ID of 31, and when i use the url http://router_address/sign?up_publicID I just get the regular login page without the signup option, I do have signup enabled.

The next question I have is, my 750 sits behind my DSL router, so the wan interface on the 750 is set to 192.168.3.1, which connects to my DSL, which then goes out onto the internet, so Paypal verifications don’t return. I gather I need to configured port forwarding on the DSL router…but which ports do I forward?

any help much appreciated!

must have a public IP for one, also the link changed in v5 as well.