How do I enable PIN access for added security?

To enable PIN access for added security, navigate to Settings > General > PIN Access. The next screen asks you to back up your account, given that recovery is the only way to access your account if you forget your PIN. Tap Continue on this screen to perform the Personal backup.

Once you've backed up your account, you will be able to type in a 4-digit PIN, which you will need to do twice in order to verify it. From here, you can choose when the PIN should be required: to unlock the Fedi app, view Nostr details, or both.

You can also change your PIN on this screen by tapping Change PIN; entering your current PIN; and then subsequently entering the new PIN twice.