I am not sure if you have access to the Manage Domains section of the panel if you do not have a hosting plan attached to your account, but if you do...
Go to Domains -> Manage Domains, click the small [DNS] link next to your domain then add the main A-Record for your domain (leave the 'name' blank), pointing to your personal machines IP address. While you are there you can add an A-Record for www as well.
Of-course, this assumes that your personal machine has a fixed, publicly accessible IP address.
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