Sim Rollback I messed up my land :P

Hello I was in a hurry doing some land moving and accidently sunk the whole sim, I tried revert and that took it way back. This has happened by another estate manager and after rebuilding I found out about the sim rollbacks, I forget how to go about doin this. Can someone point me in the right direction. I am the only tenent on the sim. Thankyou so much

you have to contact a linden, it should be somewhere under your estate tools, if nothing else someone in live help should be able to point you in the right direction