When you particularly enjoy a specific Member's music and are regularly reposting their work, you can add them to your Starred List by clicking the star under their name on the Earn Dashboard:
If you so choose, you can remove them from your Starred List whenever you like by clicking the star again:
To send music to your starred members, go to the Promote Dashboard, make sure you're on the Direct Requests tab and open the filter:
Then toggle on "Show starred members only" and Apply Filters:
You will then only see your starred members in the list of members to send direct requests to.
You can also see who you starred and who starred you on the dedicated starred members page. You will also be able to directly send repost requests from here.