Topic: info about loopback

hi everyone
i bought today a babyface, very happy so far!!

i'm pretty noob in audio recording and i would like to ask you a thing.
I'm using propellerhead record, that uses a close enviroment(no plugin...), but i would like to use guitar rig too.
I read about loopback but i cant understand how to use it.
I need to know i f i can send the signal processed by guitar rig to the input of Record.
If that is possible, can you tell me how to set totalmix?

Thank you in advance,and sorry for my poor english!
FEDERICO