Which are correct with the given meanings:
1) If you think they might do anything about this, you are wrong.
Meaning; If you think they will do something - no matter what - about this, you are wrong.
2) How about doing anything to help them?
3) How about doing anything at all to help them?
Meaning: How about doing something - no matter what/no matter on how small a scale - to help them?
This is the place to post questions and discussions on usage and style. The members of the Wordwizard Clubhouse will also often be able to help you to formulate that difficult letter.
End of topic.