How do I connect my iMac to the Internet wirelessly?
I currently have it connected to an Arris router/modem via Ethernet cable.
Open Network preferences. Select the Airport/Wireless port from the list. Click on the button to turn it on. Wait until you see the left dot turn green to indicate it's connected wirelessly.
I would not use wireless in place of Ethernet. The latter is both faster and more secure.
Retrieving data ...