Main Menu > User Settings > User Settings
Edit you User Name or login email and click 'Update'.
The User Name is only used internally on your account and setting this can be useful if you decide to go to a multiuser config in the future as it will appear in the event logs.
Changing your email address will also immediately change your login email.
Main Menu > User Settings > Password
Enter your current password and enter your new password twice to change. As with all passwords, we strongly recommend using a long, mixed letter/number combination for maximum security.
If you are not the Account Master in a multiuser configuration, then you cannot change your own password. You need to contact either your Account Master or an Admin User.