In some cases, you can be required to put a "digital" signature on a document for Acrobat. This is different from normal signatures because it uses RSA, a cryptographic scheme to prove that you are the person who signed it. This is useful for documents that need high security and assurance for auditing purposes.
If you forget the password to your signature, you will have to create a new one. Note that the password for a signature is set up when you create a Digital ID in Acrobat and is not the same as your SEMO password.
Let's go through the process of adding a digital ID for signing documents
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In Acrobat, select the hamburger menu 
(Windows) or Acrobat menu (macOS) and then choose Preferences.
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In the list, select Signatures, than More