As an administrator, you may manually add subscribers in the Omnilert system's administrator portal.
To manually enter a subscriber in Omnilert, open People >> Subscribers >> Add Subscriber on the main menu.
Then simply fill out the form to enter that new subscriber's information. (Enter a username, first name, last name, a password, etc.)
(The Groups and endpoints available will be determined by your account settings, of course.)
Add mobile phones and/or email addresses as appropriate. New devices added by the admin will be added as if they were already validated in Omnilert.
When finished, click Add subscriber to create this new subscriber as "inactive" or click Add subscriber and make active to create the new subscriber as an active subscriber (who will receive alerts.)