Hello Maria,
We are sorry that you’re having trouble with this feature. If you’re using Acrobat web you can follow this steps:
- Login with your account
- From the top menu in E-Sign tab select Fill & Sign
- Select the file that you wish to sign
- On the E-Sign panel in the left side select your signature then the pencil button
- It should open a panel where you can modify your signature, either by typing, drawing or uploading an image
- After you change your signature it will be saved, you can always go back and modify it
Also, here is a helpx link that might be useful for you if you’re using the desktop app: https://helpx.adobe.com/acrobat/using/signing-pdfs.html?screen=classic ( https://helpx.adobe.com/acrobat/using/signing-pdfs.html?screen=classic )
Hope this helps you,
Adobe Acrobat Sign Team