How to Save Changes to a PDF Form. Adobe Acrobat enables authors to create PDF files, such as product order forms or personal information forms, that Adobe Reader users can fill out.

Click "Extend Forms Fill-In & Save In Adobe Reader." This will enable your recipients to fill in your PDF form, type their digital signature and save their electronic responses.

There's also an update to the desktop app, Adobe Reader X (10.1.3), which includes the same Ink Signature Tool and EchoSign integration available in the mobile version.

Oh, and you also didn’t feel like shelling out the $4.99 that PDF signature apps run for these days. How nice would it be if the actual Adobe Reader app included a feature like this. Wait, they do?