Usually RCV is an initiative or referendum depending on how your state does it. In mine, it’s just a separate issue on the back that we have to vote for, alongside things like “should we institute a tax for schools” or “should we approve building a new park”. Entirely separate from voting for candidates for any position.
An ex-coworker of mine recommended Mango Languages, which is supposed to be much better and also if you have a library card, you can usually get a subscription for free through them! The lessons are probably a little longer than 30 seconds, but not too much longer. I’d say a minute tops.