which poker room do u play
usually rakeback in the following forms
1. accumulate VIP points , and use VIP points for cash/tournament ticket/merchandise etc.
2. receive instant rakeback with cash credit in your account.
3. after reaching a level, have some good customer services, like VIP host, freeroll for some live event package....etc.
just log on to the poker room's home page u registered, and the way - how to get rack back is there.