The Primary Contact for your Player is typically set by your Team's/Club's Administrator. If there is a problem or a correction needed, you can reach out to your Team's Admin to manually make the change. If you'd like to make the change yourself, see the following instructions.
Once you've added an additional contact to your account, click CONTACT INFO in the left-hand menu. From there, simply click the "Transfer Ownership" link next to the Player for whom you'd like to change the Primary Contact. You'll have the option to select an existing Player Contact.
Note: Only Primary Contacts (e.g. the Account owner) are able to transfer ownership of a Player account.