Try Foxit Reader 4.3, which allows you to add text to any PDF. After installing the program, simply open your PDF in Foxit instead of Adobe Reader, then click Comments, Typewriter Tools ...

Learn how to add page numbers to PDF files using free online tools or PC software. You can set position, font, etc., for page numbering.

Add a PDF and then click on the Handwritten Signature tool present under the Home menu. After that, click on Place a Handwritten Signature option. It will open a box.

Select the Sticky Note tool from the Annotations panel. Click, or click and drag, on a PDF document page to create a note. Type your comments in the box created by the tool.

Use the Markup tool (the pencil tip icon) to add text, annotate, highlight, or sign the document. Tap the Share icon to send the document as a PDF via email or text.

Click Add PDFs and select all the files you want to merge. You can rearrange the order or sort them by name and preview the result. When you're ready, click Merge , then name and save your new PDF.