For each clinic that you join to an existing group and enable for ePrescribe from Dentrix Enterprise, you must add that clinic as a site from ePrescribe. A stand-alone clinic or the primary clinic of a group that you enable for ePrescribe from Dentrix Enterprise is added automatically as a site in ePrescribe.
Note: If a user attempts to open ePrescribe while logged in to a clinic that has not been added as a site in ePrescribe, an error message appears, and the user will not be able to use ePrescribe until the clinic is added as a site.
To add a site in ePrescribe
Log in to Dentrix Enterprise in the primary clinic of a group with a user account that has been enabled as an administrator for ePrescribe. Then, in Office Manager, click the ePrescribe Task Mode button 
on the toolbar to open ePrescribe.
Click the Settings tab.
Click the Site Management link.
The Site Management page opens and displays a list of clinics that have already been added as sites in ePrescribe.
Click Add New Site.
The options for adding a new site become available.
Set up the details for the site: name, address, phone number, fax number, time zone, general preferences, and printing preference.
Click Add Site.
Note: Do not confuse the Add Site button with the Save button (in the lower-left corner), which is for the Universal Account Settings section of the page.