Here is an image that may be easier to read for many people...
This one uses a standard LED any color, with series resistor of 1k
The enclosure does not exist in this ilustration, that's up to you...
Any Light Emitting Diode, except with already built in resistor, can be used.
You'll need three banana plugs as shown.
One momentary push button
One 1k 1/4W resistor
One LED color of your choice any size.
Wire as in the image and it will work.
Cheers,
have fun with the project...