Authentification for Firewall Config won't accept password.

[Thorin]

Very new. Hope this is in the right place. Could not find the same problem elsewhere in forum. I have checked many times that I am putting password in correct and even copied and pasted. It says unsuccessful. What am I missing? Thought I would try resetting the password as per manual but I get two letters into my username and it types out a bunch before I can even finish. Password works eslewhere anyway. Completely new to linux. Thank you for any help.