How do you add FTP site after domain is already created?

OK, I installed HC7 and setup a few domains. Now I setup Serv-U v6.0.0.2. How do I go back and add FTP sites to my existing domains using HC7?

For existing domains you can create new ftp users for these sites. Login in the panel as Webadmin go to User manager --- Add User ( this will add additional ftp user).
Then you can set permissions on the ftp user from webadmin level path Domain---Ftp User--Edit User.