Ryzom

When I signed up it gave me an account password which is a load of gibberish that I'll never remember. It said at the time that I would be able to change it, but I've had no luck trying to find where to go to change it. Please help.

Note this is the account password, not the game password.

Use the 'lost your password?' link on the account management sign-up page or the 'forgot your password?' link on the main Ryzom page.
You cannot assign your own account management password and will have to record it or just get a new one every time you want to sign in.