Introduction
cPanel accounts must first be registered before they can be used to make a purchase within the cPanel store.
Procedure
First, visit https://cpanel.net/ and click on account login. Once done, there will be a login page and a link that says Create an account.
When the account is created, please log into the newly registered cPanel store account. There will be a link at the top of the cPanel store homepage that states verify your email here. Click the available link to verify the email.
Once verified, the account will be fully registered.