Adding a new extension in Verba multi-tenant environment has two possibilities:
Add an extension in the default environment to the relevant environment
Login to the desired extension with a user with full user rights and add the extension 'inside' the environment
The first option is a global solution of adding users to Verba multi-tenant system.
To create the user in the default environment, log in to the default, '0000', environment with the administrator user.
Under 'Administration/Extensions' you can locate on the top right corner, a drop down menu, the 'Current Environment' menu. Here you can select the desired environment and click the 'Add New Extension' link above.
The extension form is the same as the standard Verba system's extension form.
You can find out details about the form and how to add an extension: Extension Details
The second option is that you can add the extension in the desired environment's administration page.
Login to the relevant environment with a user account from that account and follow the instructions set out in the Extension Details article.