This is pretty old type of router, but give it a shot.
You need to access router setup page, which is, I believe
http://192.168.1.1 (you may double check manual)
Default username, and password are:
admin On my Belkin, ports setup are located at Firewall>Virtual Server section, but anyway look for something like this (I use uTorrent):
In case of Bittorrent, you'll set only TCP type, not UDP.