It's not an uncommon occurance for a webmaster to either sell their site or to give it to another party to maintain and operate and as such we are more than happy to work with you in these situations.
The basic process is that we need the new owner of the account to fill out our registration form at https://www.mddhosting.com/support/register.php. We will then need you to submit a ticket to the billing department requesting that we transfer the specific service from your client account to the new owner's client account.
We may take other steps to verify the legitimacy of the request and we cannot guarantee that we will be able to process every change of ownership request but we will always do our best to work with you.
If you have any questions about this by all means please feel free to open a ticket in our billing department.