".....i dont have a cable/dsl cable it is usb powered internet you plug it in and connect......"
So you are using Cellphone type internet ? I wonder ?
To connect the three computers (presumably in the same house or room) connect them by ethernet cable* via the router's ports. Follow the instructions for networking that come with the game but also disable firewalls on all computers and enable file sharing on the appropriate folders on each machine. Check out Windows' Help for further instructions on networking.
If you want to use wireless, get things working wired first. Wireless is much slower.