You should only do this if instructed to by SWOOP Support as re-installing may have un-intended consequences.
The instructions below must be performed by your Workplace System Administrator.
Go here https://workplace.facebook.com/work/admin/apps/ (or alternatively go to your Workplace instance and click Admin Panel / Integrations).
Click on the SWOOP Analytics application and you will see the following:
Click on the 'Uninstall' button and follow directions to un-install.
After this please proceed according to: Migrate SWOOP from a Custom Integration to Workplace App Directory