How do a make a correction in a filled field with Acrobat.com?

This question is quite simple and I'm sure I'm not the last person to ask it. The problem is you, Ajlan huda, are the only person that wrote an "answer". Unfortunately, your answer makes no sense to me. I have been filling out pages of documents "New Patient Information" for a Dr. I really need to see. I must email this "packet" ASAP in order to  get an appointment with this doctor.

This Adobe product, "Fill and Sign Documents" has all the bells and whistles and it is very convenient and easy to use. Before I decided I had filled out all the appropriate sections, I went back and noticed I could have said some things in a lot of fewer words which would make it easier to understand to the reader. I also found places where I marked an "X" when I shouldn't have, put in a wrong date, and other minor miscellaneous errors.

I'm sorry, I just don't understand your "comment" in reply to a direct question. It makes no sense. Is there or is there not a way to delete a filled-in section and re-write it. Or a way to delete an "O" and change it to an "X"?