1. In Acrobat, open the "Preferences" menu.
2. Select "Signatures" and then click on "More" in the "Identities and Trusted Certificates" area.
3. Click on "Add ID"
4. Click through the menus here with these settings, then fill out the info for the ID accurately.
5. Enter the password for this file. Make sure you have this password saved somewhere because it cannot be recovered if lost, so you would need to make an entirely new ID.
6. Once you're done, you can sign with this Digital ID by going to "All Tools" and clicking "use a certificate", then "digitally sign". This example is on a blank document, but you can select a signature field and do this process for finished documents.
7. Select your new Digital ID, then after you "continue", enter your password and sign the document.
