Navigate to Connections
Under settings, go to 
Connections under the My Personal Information section.
Done!
That’s it. You have successfully uninstalled Superjoin from your Salesforce account.
Although we’re sad to see you go, we assure you that your Salesforce account is no more accessible with Superjoin. If you wish Superjoin to remove all your account related meta data, reach out to [email protected] and we will assist you.