Type an address and press Add. They go on the beta list and get an email with their code and a link to sign in.
Added with the type, free Gold days and invite days set on the Add tab.
Open beta lets anyone who signs in straight into the app, and flips the login copy and the waitlist email with it.
New invites are stamped with this wave.
Only emails queued after a change use the new link.
Tester invites promise free Gold, so they stay off until the gated build is in production.