All delegates should have received their credentialing email from Voatz. Please follow the instructions in the email to get credentialed as soon as possible. Then go vote in the practice election.
Getting credentialed early helps the party better identify those delegates that may be having problems, and help them resolve their problems sooner, well ahead of the voting period.
Voting in the practice election helps you to see how voting in the app works for both a two candidate race, and a RCV race with more than two candidates.