Who owns a Backpack account?
The Backpack account owner is the person who originally set up your Backpack account. The account owner is the only person who can up/downgrade plans, change credit card billing information, and cancel accounts.
To change account owners, the current account owner needs to choose the Account link in the upper-right corner of Backpack:
Then scroll down to the Change account owner section and choose the person whom you want to be the new account owner: