how do i change my password for my notes if i don’t remember having a password

Are you asking to assign a password to a Note that has not been previously locked? 👉 How to lock or unlock notes on your iPhone or iPad - Apple Support

OR

Are you asking to replace a password which has been forgotten? - This cannot be done. You cannot change the password to a locked a noted. You have to keep guessing till you get it right.

Axel F.

You are welcome. Glad you have the issue resolved.

Axel F.