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To create a self-signed digital ID

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Type in and confirm a password. Be aware that you will be using this password to sign a PDF document.
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See https://help.rit.edu/sp?sys_kb_id=170e3fa9db1f4c10881c89584b96196b&id=kb_article_view

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Note: In case you forget the password, you will need to delete the Digital ID and create a new one as there is no option to reset the password.

To create an appearance for your certificate-based signature

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You may want to include an image of your handwritten signature or a logo when signing a document. To do so:

• In Acrobat, click on the Edit menu and choose Preferences > Signatures.
• Click on More for Creation & Appearance.
• On Appearance section, click on New.
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• Select Imported graphic to add your handwritten signature or a logo. After selecting the file, click on OK -> OK -> OK
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To Sign a PDF Document

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• In Acrobat, open a PDF document, fill the required fields, and select the signature field
• Select Certificates tool on the Tools tab, then click on Digitally Sign
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• You will be prompted to select the digital ID that you want to use for signing. Select the file and click on Continue. From Appearance menu, select theappearance you created, enter the password for the digital ID and then click on Sign. You will be prompted to save the file.
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References

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• Certificate-based signatures - Adobe Acrobat