Re: Trying to edit text using Acrobat Pro X but getting "All or part of the selection has no available system font. You cannot add or delete text using the currently selected font" error message. What do I have to do to continue editing the text please?

Yes, you can only edit the text if you own a suitable licensed font. Often the font is not suitable even if you own it. Editing is far from always possible. But you might be able to change the font to a similar one then edit.