The Quad Alphanumeric Display comes with a backpack that you will need to solder together. Follow the guide to complete this assembly.
The access pins can cause the circuit to be too large to fit into the enclosure so you'll need to trim these. Use flush diagonal cutters to clip off the pins from the back.
Measure and cut 4 strands of wire wrap to about 20mm in length. Solder these wires to SCL, SDA, GND, VCC and Vi2c pins on the 14-segment LED Backpack.
Build an on and off switch by measuring a JST Extension cable and splicing the positive wire between the slide switch. We'll need it to be as small as possible, so cut off the pin and solder the wires to the small nub that's left over.
Use heat shrink tubing to secure the spliced ground wire connections. These little slide switch come in handy in many projects, so it's a great idea to make extra!
You'll need to solder on a female JST connector to the back of Trinket . This will connect to the male JST connector of the slide switch.
Use a panovise jr. or third-helping hand to secure the backpack in place. Lay the trinket over the backpack and thread the wires through the corresponding pins.
Ensure the wires are long enough so that the Trinket has enough room to plug a USB cable in for reprogramming.
Solder wires as listed below:
#0 to SDA
#2 to SCL
VCC to VBat
Vi2c to 5v / 3v