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You need a digital signature to sign documents in LiveCycle. You can create a new one if you don’t have one, or if you have one but forget your password, or if you need to change your signature, or if you have issues with your current signature. Note: the password for your digital ID is never updated. If you forget it, you cannot retrieve it, so you will need to create a new digital Id.
To create a new digital signature, complete the form you need to sign, and click on the signature field. The Sign Document window will pop up.

In the Sign As field, select the option “New ID…”
In the Add Digital ID window, select the option for a new digital Id and click Next:

On the next screen, select the option for a new PKCS#12 digital Id file and click Next:

On the next screen, enter your name and email address. Organizational Unit and Organization Name are optional:

Don’t change the “Country/Region,” “Key algorithm”, or “Use digital ID for” fields.
On the next screen, use the default filed name and location. Enter and confirm your password. This password does not change.

Click the Finish button to save your signature. Any time you need to sign a document you should be prompted to enter your password. Your current digital signature will be selected by default.