I can't get them to work

. For BTC... of course. TIA
First of all, Do you have A normal PSU like OCZ 600W? You will need 4 pin CPU cable to follow up. one Yellow to positive, one Black to negative. Do you pull two yellow and two black to, otherwise die.
After the connection, You will need to Hot-Wire the PSU to let that work.
(
http://4volt.com/Blog/archive/2009/03/12/howto-hotwire-a-pc-power-supply.aspx, You need to find the PS_ON and the COM)
http://www.techwarelabs.com/guides/misc_mod/psumod/Then, You will need to go to the specific address. If using router, You will need to set up independently.
Additionally, You will need stratum proxy to let this work as the default function is too old.