I'm a reseller - how do I add new domains?
If you want web hosting activated for a new domain, you can do it in Plesk
Click on the "New Domain" button, and add the domain
The new domain will now be in your list of domains - click on the new domain.
Configure the domain's "Hosting" "Email" and "Preferences" - be sure not to forget to change "mail to nonexistant user" - this is their "wildcard" mail address where *@theirdomain.com will go. (IMPORTANT: This must be a valid email address or a mailbox you create in Plesk or all mail will bounce!)