Hi Les, what you have on that switch are JST connectors. Sometimes known as BEC connectors. The RX end will fit your receiver . You can plug it in any free servo socket. Just make sure red is on the middle pin and black towards the outside of the RX case.
Then you only need to match the plug on the other side of the switch to your battery, which unfortunately you omitted to show us 🤔
Looks like the receiver has the standard JR type plugs.
Cheers Doug 😎

Really the only problem is your confidence, just make sure the polarity is correct. I can't see on your pics what make your radio set is, you should be able to get a match from your model shop.

Thanks Wingcoax. How do you know what the plug size is called or named. I ordered this small On/Of button but the plug size is different. Could I cut the black and red cable and just swap the plugs over. is there a danger in doing that. I would seal the joins carefully.

As your receiver says"4 channel" they are for extra servos. Any switch can be used as long as the plugs match.