On Aikapool in your settings, where you set your payout amount etc, there is "Private Group ID", set that to your user name for Aikapool
And tell me in the bat file where in the line to register this ID?
It will be the user name that you registered on aikapool. So if you're pool mining, once you've set your Private group id to your username the pool will change you over to solo, without you needing to change your bat file.
PhoenixMiner -pool stratum.aikapool.com:9876 -wal Example.worker1 -pass x
Registered on aikapool as Example and then set my private group id to Example