Adding additional user licenses for an app subscription can be done in the Salesforce appExchange on the appExchange’s MyAccount page.
https://appexchange.salesforce.com/myAccount
A list of apps installed in your environment will be displayed. Click on the ‘Modify Subscription‘ link, and a popup window will prompt you to with the app’s license and subscription information.
Enter the new user license count information into the popup window, and click the ‘Save’ button.
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