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You can do this by going to Settings under icon next to the user avatar on the top right in the main menu.
Go to "Manage Users" under Users & Permissions section.
You can access the number of licenses purchased for "Core" and for "Contract" and the number of licenses used.
You will be able to add users through 2 two methods. It can either be added via the Actions button or via the Add User link at the top of the page.
Basic information such as the first name, last name, email can be filled out.
Click Save, and the new user is now added.
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