Tail Slate for an audition means you say the info they’re asking for at the END of the video, versus at the beginning. You don’t need a clapperboard. That would be for if you were on a set and trying to sync sound with the clapper and let the eventual editor to know what take they’re about to see. For an audition that’s not necessary.

Framing shoulders up means they are ok with the audition close up on your head, without having to see much of your body. Think of a ‘close up’ shot in movies on just the character who’s speaking.

So do the scene they want, and then say your name, who your agent is, if you have one, and any other info they’re asking for. Then edit it together with the scene first, and then your slate at the end.

Hope this helps :)