How do I improve my password after being denied (password too similiar to previous password)

Question

I tried to change my password (on MY machine), was denied, password too similar to old password. Just want to add a few characters so I can improve it, but still REMEMBER it!

Answer 1

Found it, simple, should have known. Entered in terminal: "sudo passwd (my user name)", that worked. Added 4 characters, now maybe I can remember new password!