Have you checked out Andrew's Quick Start Guide? Click here and he does a great job walking you through it.
Quote from that step - "Next, put your microsd card into your computer. Take the firmware.bin and config.txt file (from Eclips3D Firmware download) and move them onto your sd card. Now eject the sd card from your computer and insert it into your Azteeg, but do not connect it to the computer yet. Don't worry, we will connect it in the next step
Install Repetier host. After that, you may leave it for now. Don't start the program just yet. We will come back in a few steps once we are ready to get the printer moving."