Assign Public IP (not Elastic IP) after instance launched

The instance that you launched without a public IP will stay without one as it is only assignable when you launch the instance. Even having a subnet with auto assign public IP switched on will not assign a public IP to your instance if, when you launched the instance you chose not to have a public IP.

The only way I know is to select assign a public IP before launching the instance or having the subnet set up to auto assign public IPs which will do that only when you launch a new instance.

So to summarize:
It is not possible to assign a public IP after launching that instance unless you use EIPs.

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