After successfully creating a instance via this tutorial . Attach a Elastic IP address to your instance.
To associate a EIP to your instance, locate and click on Elastic IP’s under Network & Security present on bottom left hand side of your EC2 management console.
#Next click on Allocate New Address -> EIP used in EC2 -> Yes, Allocate.
#Right click on newly created IP address -> Associate -> Select instance from the drop down -> Yes, Associate
This was all about EIP. Next we come across another important thing after creating a instance i.e Security Group.