You can get access to your account at the top where it says "My Account" (see the last image in this post). Here you can chance any of your account information. Once in the account area (as seen in the image below) you click "Edit" and then "personal information" to access your account's personal information. Under "account" you can change your password and language preferences.

You cannot however change your username. Your usename must stay unique as it is linked to various areas of the system. However, your username has no bearing on what information is used on your certificate or correspondence sent to your supervisor. Only your first and last name are used on those documents and emails. You can tell what your first and last name is in the system by looking at the name at the top of the screen (see the image below) However, some emails that get sent to you by the system may use your username, but these will only be emails sent directly to you. They will not be sent to anyone else and are purely for administrative purposes.
