Need to know how to set up WiFi for FireHD 7 on hardwired iMAC desktop Got a Fire HD 7 for christmas present. My iMac desktop &amp; printer is wired via ethernet into a Motorola SURFboard eXtreme Wireless Cable Modem &amp; Gigabit Router (3 products in 1 device) My question is HOW do I set up Aiport(WiFi) on  my "stuff" so I can use the Kindle in other places in my apartment using wireless????and still be hardwired for desktop &amp; printer??
If you have working internet over ethernet into your iMac then all you need to do is to switch on Internet Sharing from the System Settings app and presumably your Fire HD will be able to connect to that (I don't have a Fire HD so cannot explain that end of it).

Check out http://support.apple.com/kb/PH13855