Log in to self-serve, go to the Plan and Add-ons tab and click into My
Add-ons page. Scroll down and you'll see columns of Add-on choices.
Click the + next to the Add-ons you want (you'll be able to see the
quantity you're purchasing), and click the ...
Since you can't change your community username by yourself, try sending
a private message to the moderator team and ask them if they can change
it for you. Include your account number or phone number to help speed up
the identification process. Click...