How can I see hrblock foressing up on my taxes

You will need to show the amount of your loss in what you indicate was an error on the part of the tax preparer. Also to sue for professional malpractice, you will need an expert (accountant) who would be able to come to court and testify as to what the tax preparer did wrong, and how you were harmed as a result. Depending on the amount invovled, it may or may not pay to pursue a lawsuit.