Hello, I have been trying to implement FreeRTOS in my LPC1343, but for each step I'm encountring with a errors. I would like to know whether I can use FreeRTOS is LPC1343 using IAR. If yes what are the steps I should follow. Thank you

Provided it has enough RAM, yes you can use it.

http://www.freertos.org/FAQ-how-to-use-the-FreeRTOS-support-forum.html