Once logged in, you can go to User Admin and click on User Info. You should now see the 'Security Management' box that will allow you to change your password. If you don't see it, please play with the zoom settings (e.g. change the zoom setting to 100%). Google Chrome browser is preferred. 

Please note that the new password needs to have a minimum of 7 characters, including at least 1 non-alpha numeric character (e.g. !). Spaces are not allowed. Password is case sensitive. 

After creating a new password, try to log out and log in again to see if there is any problems.