Modifications to existing Auto scaling Group

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This post will answer following questions:

How to make changes to existing Auto Scaling Groups in AWS.
How to changes no. of EC2 instance value for scale out and scale in Auto Scaling Group. 

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From the EC2 instance launch page, Navigate to Auto scaling --> Auto scaling Groups(as highlighted below).

Click on edit, Now to change the EC2 instance value.

Make all the required changes. Here in my case i am changing Min from 2 to 1 and max from 2 to 6 EC2 instances. 

Finally save the changes.