Please find below steps to “Change instance type aws,resize ec2-instance”

1. Login into AWS console.
2. Go to EC2 Dashboard -> Instances.
3. Select Instance which is you need to change type or size.
4. Select Actions -> Instance State -> Stop.
5. It will give one popup window “Stop Instance” like “Are you sure you want stop these Instance?”. Click on “Yes, Stop“.
6.  When instance stoped Public DNS, Public DNS set to empty.
7. Next go to Actions -> Instance Settings -> Change Instance Type -> Select instance type like example “m3-medium“.
8. Next Select Actions -> Instance State -> Start.
9. After change Instance Type -> Public DNS, Public DNS changed to new.

Find video here https://www.youtube.com/watch?v=KongDsEdboA