Follow the link and click register to vote. It will take you to your states voting page. It may be different for ya'll but my state I was able to change it online within minutes. Fuck the GOP. I'm waiting for a party that truly represents me.

https://www.eac.gov/voters/register-and-vote-in-your-state

Edit: You cannot vote, in most states, in your parties primary if you go independant. Also, the calls you will get from Libs to vote for their candidate will be off the charts as my wife is an independant.