Use my old Carbonmade domain for the new one
If you're already been a user of the old Carbonmade and you're creating a new website or portfolio with the new Carbon, please make sure that you either delete or change your subdomain in your OLD Carbonmade account so you can use it for your new account.
Right now it is possible to have both, an old (v3) Carbonmade account and a new (v4) Carbon account, but you have to make your own decision on where you'd like to use your subdomain. If yourname.carbonmade.com is already used by your old account, please change it to something else, and then change it back to your name on the new Carbon.