There's no hosting account attached to the forum account you are posting, the request needs to come from the proper forum account (applies to all types of support questions). Without knowing which account is yours I don't know where to make the change.
If you do not know what forum account is attached to the hosting you can see information, and if you wish change the linked forum account, if you login to the portal and go to "Get Support" -> "Visit Forums". This will provide you with information about currently linked forum account as well as give you an option to switch to another existing forum account.
Great. You should see the change in your account control panel shortly.
Please note that there may be a small delay before it works properly, and don't forget to update any scripts you may have to reflect the change.