We're you the one that posted about registering to vote?
If so, you should register. That way you'll have it. There is a deadline to register.
If you don't like the 2 top candidate, there are 2 others, Jill and Gary.
There are also other elections that happen throughout the year. Like mayor, governor, Congress people, medical Marijuana, etc...
Make sure you know which party you want to be. If you are independent, you are not allowed to vote on the primaries. For example, independents were not allowed to vote for Bernie or hillary. Only registered democrats were.
I hope this helps.