You need to enable SSH access on ReadyNAS (System->Settings->Services), and then use any SSH client. I use PuTTy on myPC, but you can use any SSH client available for Mac. 1. connect 2. navigate to the folder where you copied BTSync, using command: cd <path> (example: cd /data/truesyncinstall ) 3. unpack package using command: tar -zxvf BitTorrent-Sync_arm.tar.gz 4. run .executable file from list of unpacked files (I don't know exact filename, you can show files using command: ls ) Sorry, it's not a detailed, but indicative guide, as I'm not a power Linux user...