My elderly neighbor needed help with iPad. So as I was helping her with it, I gave her access to my wireless network to ensure it was working properly. Now, she "accidentally" prints to my printer often because she does not choose her own printer. I know I could "forget device" from ipad but I am not physically with her right now. Is there anyway that I can remove her ipad access, by removing it from my Mac? Where do I find the list of those devices that have access to my wireless network? Thanks!
The simplest solution would be to change the network password. This can be done from the Airport Utility application found in your Applications > Utilities folder.
This will disconnect all devices, so it would require entering the new password in your devices including your connected printer.
Airport Utility also will show you devices connected to your network. See also Apple Support for Airport.