Why do you have to sign a pdf when it is printed? Not set to add documents and labels when printing:

1. Open the pdf file, edit the article, insert the electronic signature, and click the file option in the upper left corner.

2. After clicking, among the options that come out, you need to click the Print option to enter.

3. A dialog box pops up, and the option settings of comments and forms on the right are selected as documents and labels.