When logged into the FDI Bluetooth Portal, there are 3 buttons along the top of your screen.
If you click the far right button, the one which has your username on it, a dropdown will appear with the following options:
Home - takes you to your homepage where you can see your account, and all your sub-accounts
My Account - simply shows your account details
Change your password - self explanatory, allows you to change your password
If you need to change your account information, you can do so from this button.