I don't understand the LED thing

I sould have said the schematic shows to have LED and switch on a separate pin.

However, if the OP needs both on the same pin, see this link:
https://forum.arduino.cc/index.php?topic=439838.0

2016-12-05_10-37-56.png1128×906 16.1 KB

Also covered here:
Post #334
https://forum.arduino.cc/index.php?topic=445951.msg3336467#msg3336467

2017-07-09_16-01-43.jpg1132×586 155 KB

2017-07-09_9-48-23.jpg1386×957 170 KB

And #391:
https://forum.arduino.cc/index.php?topic=445951.msg3430326#msg3430326