Being part of the Designated Diamond program is awesome! Here is how to pick a Diamond:
1. Go to your Genealogy Report (Concise version).
2. Pick those who are EA2 and active at least 10 days.
3. If this is less than 20, send an invite to them all. If not, hand pick those you want to work with and send them an invite.
Now wait and see who answers you. They are the ones that would take you (and them) to Diamond Team Leader status...