How to make changes in assigning security groups for an existing security groups in EC2

From the EC2 instance launching page --> right click on the instance --> Networking -->Change Security Groups.

Assign or un assign security groups by checkbox &Click on Assign Security Groups.                                        

Deleting existing Auto scaling policies

1. Navigate to Auto Scaling group.

2.Scaling Policies tab.

3.select the correct policy.

4.Navigate to Actions drop down.

5.Finally click on Delete.