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To setup a new add-on type, go into the Content Manager, within the Add-ons tab, and then click on "Manage add-on types" at the top right. If you do not see the "Manage add-on types" button, then this means that you do not have the necessary rights configured. To solve this, go to the Back-Office Manager, and give your role the following right : "Content Manager - Add-on types" (see screenshot below).
Once this right is enabled you should be able to view the button when navigating to the add-on tab within the Content Manager as shown below.
You should then be redirected to the following screen :
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