Hi Rohan,
Using your host PC, you have to copy the downloaded file (zynq_image_8gb_2013_12_12.img.xz) to your SD card. Depending on what OS you are using, you have to follow the corresponding steps (Linux: http://wiki.analog.com/resources/tools-software/linux-software/zynq_images/linux_hosts Windows: http://wiki.analog.com/resources/tools-software/linux-software/zynq_images/windows_hosts). After that, the SD card will contain a BOOT partition where you will find an zynq-zc706-adv7511-ad9250-fmc-250ebz folder. Copy the content of this folder into the base directory.
Regards,
Dragos