I just instaled RB 411 with r52n on it and i now i need HELP

OK..Lets begin..I just instaled RB 411 with r52n on it..I installed Router OS 4.17 on it..I know how to use Winbox..But i need some guide or step by step explanation how to setup MikroTik so i can use him as wireless modem(Conect to AP which provides internet via PPPoE)and use that internet access to surf witm my desktop computer..I’m beginer with MikroTIk..Thnx for help..

Not an exact step by step guide for your particular configuration, but this should help guide you in the right direction?
http://wiki.mikrotik.com/wiki/How_to_Connect_your_Home_Network_to_xDSL_Line