Setting up IMac over Ethernet to use IPhone via WIFI

I have just stopped using a wireless router via Airport. I now use the Homeplug AV adapter system via Ethernet. I have internet no problem, but now have no network that will enable me to connect my IPhone via WIF to the internet through my IMac. Can someone please help?

Duane, not being a dumb taquito, I try not to post something of which I know nothing about. However, that still manages to occur occasionally! When the OP asked for help, I knew nothing about his issue. I had never shared an internet connection wirelessly. But in my mind I thought that this indeed should be possible with a Mac with an AirPort card. I experimented.
Not having an iPhone or an iPod Touch I used my iMac and my Mac mini. They are in rooms on opposite ends of my apartment. I set up a wireless airport network from my Mac mini to share its ethernet internet connection wirelessly with the iMac. I did it exactly as I shared with the OP. It took all of 3 minutes, start to finish. Then I walked to the other end of the apartment and connected the iMac to this wireless network and was surfing the internet from the Mac mini's ethernet connection in all of 30 seconds. It was a secure wireless connection.
I have now followed your instructions. They also worked flawlessly and because they were now familiar steps took barely two minutes to set up, walk, connect and surf. The results are identical!
However, if the OP only had your instructions to follow and did not encounter an AirPort service in Sys Prefs>Sharing, they would have been up the proverbial +cala de la mierda+, without a paddle.
Dah•veed

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