You haven't given us much to go on, but my first guess is that you paid for Acrobat Pro, and it keeps asking you to pay? If that's the case, you need to actually install Acrobat Pro, your Acrobat Reader does not change or go away. If that doesn't help please tell us as much as you can. Please also understand that editing a PDF is a DESPERATE LAST RESORT and it's often disappointing or impossible. Describe EXACTLY the sort of editing you want so we can help you understand it.