This would have gotten more help if you would have posted it in the SP Forum not the Newcomer forum. The Newcomer forum is mostly for b.net not SP.
Now onto helping you. I found the MP/Trader Profile sub-forum. It is a sub-forum under the SPF Trader Forum Look near the top just above the stickies. You will also want to read these rules for SP Trade Rules v5 Summer 2010 I know they sound old, but they are the most current I know of. Any questions or concerns about any of the rules please e-mail Thyiad until you are able to PM her. She is the final say in the rules and very helpful. Welcome out of lurking mode.
The forums that Ladvarian listed are mainly for trading purposes, if you are interested in playing multiplayer through tcp/ip then you should check out the Multiplayer subforum in the Single Player forum. People interested in playing with others using tcp/ip usually post in that area looking for others to join them.
Originally Posted by Vivi
Give a man a fire and he's warm for a day. Set him on fire and he's warm for the rest of his life.