Edit a pdf? Why do you want to edit your tax return pdf? You should not be editing it. Are you using the Turbo Tax Online version or the Desktop program? If you need to change something you need to go though the tax interview steps or in the Desktop program you can also use the Forms mode to make edits or overrides. If TT let you edit a pdf (or if you override amounts) then they can't guarantee your return. The pdf file should be exactly what you actually filed.
