Almost all US RCV elections are on conducted on paper ballots. The usual rules are:

1. Fill in circles to designate your preferences
2. Put your first choice in the left-most column
3. You can rank as many or as few candidates as you want
4. But don’t skip a column and then start ranking again to the right
5. Don’t make two selections in the same row. Multiple votes in a row will not help that candidate any more than your highest preference vote for that candidate
6. Don’t make two marks in the same column
7. Mistakes on the interactive grid will turn the relevant row or column red. An error message will also appear in the upper left section of the ballot grid
8. Click on a filled-in mark to erase it
9. The gray boxes that re-order to help you double-check your vote will not be found in official voting situations.
10. We should note that a few cities and states only allow the ranking of 3, 4 or 5 choices in their ranked-choice elections. Those ballots will look somewhat different