Open the Comment menu on the top tool bar. If additional lines are to be added then Typewriter function can be used. Import a PDF to PDFelement Pro PDF Editor.
If you don't already have Adobe Reader, it's available for free from get. Many users notice weird problems with YouTube not functioning in Firefox. Hit keys in sequence, how to highlight and take notes on pdf, don't hold down the alt key. Now you can enjoy reading your PDF documents while at the same time highlighting some important thoughts to remember. It requires no additional PDF exposure of the user. Open a PDF document in Adobe Reader. It's the marker icon on the right side of the toolbar at the top of the window.