Site Admins are currently working on adding the new races for WoW:Battle for Azeroth.
While you may not be able to add the new these toons yourself, If you log a support ticket, one of our support staff will add a place holder character with your current stats and faction.
Note: The character may not update until the new races have been added to the site and we can't update it for you after the place holder character has been added.
When raising the support ticket, provide the following information;
URL to your characters armory page
In addition, if you race change your toon to one of the new races, the character will not be updated either.