How convenient to change IP on AWS OpenVPN?

Good afternoon. I first raised my OpenVPN server on this instruction -
But faced with the fact that to change IP you need to uninstall the Instance and repeat the process of creating the server again.
How to quickly change IP another way? Mentioned Elastic IP, but I have not figured out how to use it. This is what I need?
1 answer
July 2nd 19 at 13:10
sasayaite new elastic IP
attach it to the server and voila new IP

then removed and again sasayaite and attach

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