Was reading one of (many, many) online discussions of the Hugos and SFF fandom the other day, and it was mentioned that a surprisingly high number of people aren’t aware they they’re not a juried award.
So, to be explicit:
If you are a fan of science fiction and fantasy, you can buy a Worldcon membership. That lets you nominate on and vote for the Hugos.
The ballot is already set for this year; it’s here. But a supporting membership to Worldcon still lets you vote to rank the works on the ballot, and nominate works for the ballot for next year.
You certainly don’t have to, but you can.
 Okay, I mean, technically if you’re a legal person who can buy things, you can buy a Worldcon membership, but I can’t imagine why you would buy it if it wasn’t from an interest in the genre.