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Update: Do not install Foxit.
They are bundling search hijacking surfing app extensions that will ruin your day.
The system well be using for this quick tutorial is Foxit Reader.
This is an alternative PDF reader (alternative to Adobe Reader, that is).
Its fast, lightweight, and free.
And most importantly for us, it lets you annotate documents.
For starters, download and install Foxit Reader.
Then use it to open a PDF document youd like to annotate.
you might also double-click any such marking (underline, squiggly line, etc.)
to open up a note where you’ve got the option to jot down a longer explanation.
you’re able to also change its color by clicking Open Properties.