Do you have the Epson Network Photo Print Adapter 2? According to
Epson's Site under
Networking & Connectivity Accessories, it's required to use Bluetooth, and from my experience with the Epson Photo Stylus RX595 and trying to set it up via Bluetooth, the adapter is
absolutely required and not just any USB Bluetooth Adapter (dongle) will work.
BTW, you say you have a MacBook Pro right? Assuming you have a WiFi network in your house, why not just use the Artisan 800's WiFi networking instead of Bluetooth? I hear it's much more trouble free than the Bluetooth printing from what I've gleaned online.