Hi Tree,
I have the same router in my Florida QTH. The port forwards are easy to setup, but are somewhat
hidden. You find them under the Security section under "Apps and Gaming". Then you find menus
with port forwarding within that part.
Are you saying that you tried this and it didn't work? I can test it more if you want, but it would
seem strange that you can't get it to work.
Note that port forwards work by default internally. In other words, no ports ever need to be forwarded
if using the same network.
73,
Mitch DJ0QN / K7DX