You will need to wait for it to arrive before you can create a MyDMV account. You can still change your address.
And what will they do when I change my address to register a vehicle?
we also update the title certificate record   you do not need to request new DMV documents with your new address 2   updating your address for a traffic ticket does not update your address in other DMV records 3
and what should i do when i change my address?