Hello, I am new to arduino, just got it a few days ago

So I have this 1 digit 7-segment display, I got it to work, displaying numbers and letters..
Now I want to use the 4 digit display, but it has 12 pins, and everything I find online is either 16 pins or 10 pins...
The following picture is a picture I took just now...

So I have 12 pins ...
I wish to know what pins to connect to the digital outputs, and what I connect to ground...
(Also, do I need 5v? Did not need for the 1 digit display.)
Thanks in advance, Hilmar.
