Okay, it’s not that bad. If you look at the bottom of the 2P2T switch, there’s 2 rows of three pins or solder tabs coming off of it. The center tab of each three is connected to the flip flop (not a technical term) and will make contact with the pins opposite whatever side the toggle is on. (This is a bit confusing, but if you think of the toggle as a lever that continues past the top of the switch, when the toggle is pointing down, the extension of it, which has the electrical contact, is pointing up, and making contact with the 2 pins that are on the up direction.)
So you want the input hot lead to attach to one of the end pins, and the output lead to connect to the other pin at that end of the threesome. The center pins (the flip flops mentioned above) get connected to the input and output points on the circuit board. So, if left just like this, when the toggle is pointing away from the connections you just made, it would be like the switch isn’t there. (This would be down, in my sketch above.)
The trick is to now wire up the connectors between the outside pins. For these, all you need to do is cris cross them, so that the input goes to the opposite side, as does the output. This means that when the toggle is pointed the other way, it will contact the pins that reverse what was on the first position of the toggle.
The ground is all connected, and if the board has two ground connection points, just wire it as normal, and if the board has only one connection point, connect the ground of both jacks together, and run that to the board.
Rereading this, I hope I haven’t left you more confused. If I have, pm me and we can set up time to do a quick phone call.