What a strange idea for someone from Germany. Here you are registered as a citizen and get a letter to your registered address and you take that to the voting station. Vote. Done.
There's no Anmeldung system in America. Actually voter registration is the closest thing you have to an official current address, and it's a lot easier to do (no appointment required).
Yes I know, which is strange, and I know many Americans are proud of it (no snooping state etc.) but overall I think there are more downsides to it. I feel this is an artifact from times without phone lines and computers with many small towns hundreds of miles apart (also see electorial college) and was a necessity but is now kept b/c of identity and tradition.