This post helps to add a text box to PDF using a free software and an online tool. You can adjust the size of text box, text style, etc.

Learn how to display text set apart from your main document in Google Docs with either a table or an inserted drawing.

Need to edit a PDF document but don’t want to pay for the more expensive Adobe editors? You can add text to and sign a PDF with just the free Reader program.

How to add columns in a text box in Publisher After drawing a text box into your publication, a text box tab will appear on the menu bar.

Whether you want to make text stand out, add some structure, or create a unique visual, we’ll show you a few ways to insert a text box in Google Docs.

When you need some text to stand apart from your main writing, both Microsoft Word and Google Docs make it pretty simple to add a quick text box ...

In other words, Adobe Reader won't let you add text. What you need is a program that's a little more accommodating, PDF-wise. Try Foxit Reader 4.3, which allows you to add text to any PDF.