How the fuck do you not know how to get registered? You can do it online. You can do it at the DMV. You can do it when you actually go to a polling place to vote. When I turned 18, I got a ton of mail to register to vote and register for selective service provided by both the state and the federal government (meaning I had duplicates).

It does piss me off that some states/counties don't have mail-in ballots. That is some bullshit. I can see why it's not made available online, but to not mail every single registered citizen a ballot in the mail is fucking bonkers.