how can I put my signature?

Hi Christopherl,

As I can understand from the description, you want to Sign PDF documents, Is that correct?

Please refer to the following KB link to sign a PDf document: Signing PDFs in Adobe Acrobat  https://helpx.adobe.com/acrobat/using/signing-pdfs.html

You may also refer to Fill and sign PDF forms using Adobe Acrobat Fill & Sign  https://helpx.adobe.com/acrobat/using/fill-and-sign.html

Hope this helps, and keep us posted with the results.

Regards,

Anand Sri.