To uninstall CloudyCluster you will need to take the following steps
Delete or terminate any hPC Environments you have running, by selecting the trash can icon, in the upper right corner, for the whole cluster to be deleted.
All data associated with this cluster will be removed including any EFS, S3, or Working Storage, make sure you back up any needed data to a different location.
Now proceed to the Administration tab and select Delete CloudyCluster Instance and Database, this will remove all users, collaborations and anything associated with CloudCluster, you will not be able to recover from this.
Select Delete and the database will be removed and instance shut down and terminated. The web UI will become unavailable.
Go to the Cloud Formation console to remove the Stack associated with this CloudyCluster instance.
Select the Stack and choose Delete Stack, this will remove the IAM role and Policy initially created.
View the complete CloudyCluster documentation.