Cathy,
Good question, like much of Wikitree by the time someone really understands how to find help, they don't need it.
If the question is about a specific message, then a question to the person that posted the message is best.
Requests for Arborists help should be entered as questions on G2G with a tag of Arborists.
Seems awkward, but it is the only way to be certain that the question will be seen, arborists follow the tag and will respond.