I think she is talking about having whitelists from providers that you have seen before   That is the only way of screening that I know of.  I hope that helps.

 
XOXO
Harmony Taylor

...the rest is just getting references... my recommendation is this:
Find yourself one or more of the many "newbie friendly" providers that regularly post here. I'm sure someone will float your boat Book a session, then ask them to Whitelist you afterwards.
Unless your a real jerk, most will oblige you.

Also helps to write a few reviews while you're at it. Not obligatory, but its part of the game.

Cheer