What head-unit are you using? If it has an option of Multimedia controls than at the back side of the unit there will be some extra wires and most of the time there is a mention tag on every single wire which helps you find out the volume wire, reverse, forward and etc. Just connect the correct wire with the correct steering wire and give the steering a ground wire (if required) and your good to go.
One thing I would like to share that its a jdm steering wheel with SRS Airbag which means there is a strip (Fitta) for operating the Horn which is not present in the PKDM 7th gen civic so its a must have item and without that strip your horn wont be working. All the best! Please do pm me the price of the steering wheel.