Need help programming Serial 7 Segment Display for standalone

I've no idea how to add the serial 7 segment display board as an option in arduino after trying numerous times and doing my own research I can't find a good tutorial on it, how exactly do I do this? I'm using the Serial 7 Segment Display (

Please do not cross-post. Other thread removed.

Looking at the schematic it looks like an Arduino running on internal crystal, with the crystal pins used for outputs as well. And just one 0.1uF decoupling cap for all three of the Atmega328P's supply pins (really? they couldn't spring for 2 cents more for 2 more caps?)

Not obvious to me how the interfaces work - have to do some more reading in the links to see if there's a description of how to send it data, or if you have to write that code yourself.