Click inside the text field and type your note. Add as many Sticky Notes as you desire. Save the PDF document when you are finished adding notes by pressing "Ctrl-S" simultaneously.

Adding Text Notes to a PDF Select the Text Box tool from the Drawing Markups panel. Click, or click and drag, on your document to add a box with a colored border, and type your observations in it.

In the Markup window that opens, you will see all the tools you can use to add annotations to your PDF file, and you can turn the pages to annotate throughout the document. When you're done ...