As Murtuza says, using the free version of the program, you can do basic editing jobs (sticky notes, text highlights). The software allows you to add comments, notes, highlight words or phrases and so on. You can do this using
and
buttons. If you want to edit text and images in your PDF file you will need to use Acrobat Pro. The main purpose of the free version of Adobe Reader is to open, share and print PDF files.