Depending on how LON-CAPA is authenticating you, you may be able to change your password.
To change your password, do the following:
If you cannot change your password, please use the Help link at the top right of the page and then click Äsk Helpdesk" to submit a help request to ask for instructions. University users often authenticate against the campus-wide system. For those users, changing the password used by LON-CAPA means changing the user's campus-wide password. Your helpdesk will be able to tell you how to go about that.