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.

Foxit PDF Reader is a free document viewer that supports advanced annotation tools. This lets you control the size, color, and style of inserted text or shapes.

The free version of Foxit PDF Reader lets you add a text box to your PDF files. To do this, follow the steps given below: Open the Foxit PDF reader interface Access the File menu, then Open, and ...