Hello Darlene,
Welcome to Atlassian Community!
When we install an add-on, the user will receive all the correct permissions and it's not necessary to manage it.
A while ago it was possible to find the users on Administration > User, but it was removed since there is no need to add or remove permission or groups for these users.
If you have any other questions regarding this matter, please let us know.
Regards,
Angélica
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