hey, can i use the mac remote control on the new imac 2013? if so, how?

No,

The new iMacs no longer have an IR receiver.

If you want to control your iMac remotely.

If you own an iPhone, iPod Touch or iPad.

Here's an app

http://regularrateandrhythm.com/apps/rowmote-pro/

or this

http://www.amazon.com/Satechi-MediaRemote-Bluetooth-Multi-Media-Control/dp/B0082 4948U/ref=sr_1_10?ie=UTF8&qid=1364328484&sr=8-10&keywords=Satechi

http://www.amazon.com/Satechi-Bluetooth-Pointer-Presenter-Control/dp/B00A3WRM5G/ ref=sr_1_1?ie=UTF8&qid=1364328551&sr=8-1&keywords=Satechi+Remotes

Welcome to Apple Support Communities

Your Late 2012 iMac hasn't got a IR receiver, so you can't use your remote control with your computer