There's 3x 10mm triwing screws holding the power switch on, one may be hidden under the Forward/Back switch label. Don't worry about the 2 screws on the reset button.

Pull the whole thing out, but note that there are wires on the back that're still connected to things.

Coming from the power plug on the other side, there's a Light Blue wire and a Brown wire that are clipped on to the switches. Note that they may be held in with a retention clip (look closely before you just pull at it).