It usually takes AO3 a few hours to get them to everyone, so if it hasn't showed up just yet, give it a bit and check your spam filter. You can also access them via your assignments tab on the left side of your AO3 profile, or by checking the address: http://archiveofourown.org/users/YOUR USERNAME/assignments.

If you don't have an assignment, check back here, and we'll try to sort you out.