Go to the Amazon Kinesis Data Analytics console
Click on the name of your Amazon KDA application, then scroll up and click on Actions and then on Delete application.
In the confirmation dialog box, click on Delete application.
Go to the CloudFormation console.
Click on the name of the Stack that you created for this lab. (If you accepted defaults it should be MMStack1)
In the upper right hand corner, click on Delete.
When asked to confirm, click on Delete stack.