Perhaps you can forward me another example when you return from holiday. I want to change it to Arial which is definitely in my system. However, you may not always want other users to be able to use those editing tools on your PDF. Here are the detailed steps below. Text edit comments do not change the actual text in the PDF.
 
 

Mark up text with edits, Adobe Acrobat

 
Download a free trial of a fully functional version of Adobe Acrobat Pro. Discover the many benefits of the Acrobat Pro PDF editor. Replace text, add a note, insert or delete text, and highlight, strikethrough, or underline text in Adobe Acrobat.