As moderator, or WikiTree leader, you put the profile ID or URL in the question spot or box that says ... WikiTree ID/URL if this relates to a person or free-space profile:
After you do that, click on profile and you will see the question appear on the upper right side of the profile. (Just like you would see with a Wonderful WikiTreer type post).
Otherwise, like our friend Louis did, the member would post a question and one of us will do it for them.