Apple Imac G4

This G4 iMac (2002-2004) had neither an Airport card nor Bluetooth. This was an optional purchase. You can resolve this deficiency by purchasing a used Airport card for the G4 iMac, probably at eBay or some other online vendor of used parts. Even when you do fit one inside the iMac it will be 802.11b or g depending on the year your have, which today will be very slow, but it’s better than nothing. Do some research to see which model and get the appropriate Airport card. You could also use an ethernet cable if your router is near the iMac. This will provide faster speed and be easier to fit. You can find some videos on YouTube to show you how to fit an Airport card.

The lack of Bluetooth can be solved by getting a Bluetooth dongle. These devices fit into a USB port and provide a Bluetooth connection for the computer. You didn't mention which macOS your iMac has. Panther? Or is it still on Jaguar? This should be adequate to support a Bluetooth dongle.

I love these flowerpot iMacs and they remain my favourite iMac design because they are unconventional and also a delight to look at. At the time they were very expensive so I bought an eMac instead.

Hi,

Another way to achieve wireless connectivity would be to use an appropriate Wi-Fi range extender with an Ethernet port. A number of these devices can be configured to work in a wireless Ethernet bridge (or client/media adapter) mode. You may want to have a look at Edimax EW-7438RPn Mini or TP-Link RE200, just as two examples.