It is a drawn handwritten signature, not an electronic signature.
For procedures that require an electronic signature you need a certificate (.p12 file).
How to do it with Requisito Listo
Draw your signature once with your finger.
Pick the PDF and the page.
Place the signature and create the PDF.
At the end you'll see a checklist: size, file weight, background and format. If something doesn't comply, it tells you what to fix before the portal rejects it.