you can set up ftp user and password in DH panel --> Users --> Manage Users
After you create a user, you can go to DH panel --> Domains --> Manage Domains --> Web Hosting --> Edit to give the right to a user to access the site.
If you encounter problem to add ftp uesr in IE, try to add ftp user in firefox.
Each plan has a free domain name. You can add domain in DH panel --> Domains --> Manage Domains --> Add New Domain/Sub-Domain
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