Are you wanting to run a OS from the card or install an OS from the card. Which OS?
I would imagine the process is the same as making a USB stick bootable. However, the OS you are using to create the bootable SD card may see it as an SD card and not a USB stick, and thus not recognize it as a device to make bootable. You could get one of those readers that fit in a USB port if that is the case, just to get a bootable SD card. Then try and see if it will boot with the card in that SD slot. Will probably have to hit whatever button brings up your boot menu or edit the boot order in the bios.