If you want to add a signature box to a PDF file, just leave the place where he needs to sign blank. Bian Xiao will briefly explain to you how to operate it.

Reference software: fast PDF editor

A. First, we open the PDF editor, then import the PDF file into it, and then proceed to the next step.

B when we import a PDF file into it, we will see the "edit content" column in the PDF editor and click it.

C. After clicking, we can see a small blue box in the PDF file, and then we can edit it. Just press the space bar where you need to sign!

D.we can save the file after editing!

The above is the answer of the Lord's own point of view, I hope it will help you!