To manually add a group to an account please open the admin console by going to https://nut.whatiswr0ng.com/admin/ or clicking the link

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Under authentication, click users to pull up the list of users.

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Scroll to the user and click their name link

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Scroll down to groups and choose the groups to add, using control click to choose multiple if necessary and click the right arrow to add it to the left list.  You may also double click the role to move them to the other list. 

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Scroll to the bottom and click Save to make the change

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You're done.  You can verify the change for a discord user by looking at their roles or the dyno log.