Before you terminate the instance, verify that you will not lose any data by checking that your Amazon EBSElastic Block Store volumes won't be deleted on termination and that you have copied any from the list of stacks in the AWS CloudFormation console, select the stack that you want to delete (it must be currently running).
To delete a Stack, proceed as follows:
Click on the Stack and then either right-click or choose Delete Stack from the Actions drop-down menu.
A message will appear asking you to confirm deletion.
Click Yes, Delete.
Note – After stack deletion has begun, you cannot abort it. The stack proceeds to the DELETE_IN_PROGRESS state.
After the stack deletion is complete, the stack will be in the DELETE_COMPLETE state. Stacks in the DELETE_COMPLETE state are not displayed in the AWS CloudFormation console by default. To display deleted stacks, you must change the stack view setting as described in the CloudFormation User Guide under Viewing Deleted Stacks.
If the deletion failed, the stack will be in the DELETE_FAILED state. For solutions, see the Delete Stack Fails troubleshooting topic of the CloudFormation User Guide.