Alright so, the modem is a standalone modem and the WAN page doesn't have a 192.160.0.# IP.
Also, I don't know how to, for example, use the DMZ for the modem. By that I mean, I can use the one in the D-Link Advanced section but I don't know how to access the modem's version if that is what you mean and how can I see what my my router's DHCP IP is? And, what is and how do I change the DIR router's IP?
uPnP is enabled and if I can't find a way to fix this I'll try the Virtual Server option. Thank you for helping!
EDIT: I quickly tried the Virtual Server but the ports still are closed.