How to configure MS Proxy Sever 2.0

Can someone help me how to resolve this problem.
I am installed the MS proxy sever 2.0 in my PDC. This PDC have two NETWORK cards. The 1st NETWORK card run from DSL box(the DSL working fine), and the 2nd NETWORK card run to the hub. I tried to get other workstations running DSL, but it doesn’t. Could someone help me to fix this problem. I am very appriciate that.
Johnny