How to set up uverse home network with 2wire gateway

I recently had att uverse installed. It uses a 2wire gateway. When the installer set it up he said everything would work as before but it does not. My home network is non functional. Sure I can get all computers on the internet but I can't share my printer of connect to other computers through the gateway. ATT say call our pay support line to help you with that but from what I read they don't know what they are doing either and its driving me crazy. This is just a network issue surely someone other than att knows how to set this up. Please help.