How to Connect a Protection Diode in a Circuit?

Hello fritzers!
How to connect Diode in a led circuit? I used 1N4148WS
I can connect connectors with each other but still no response with connection, Could you offer a example of led circuit with Diode?
Best regardz.

The best bet would be for you to upload the sketch you are trying to connect (the .fzz file, upload is 7th icon from the left in the reply tool bar) so we can see what you are trying to do and suggest a solution.