Can I affect front end code?

Thanks. I have read that but I just can’t understand it. It starts simple enough and then decends into techno-babble that I am trying to learn.

“You can create a channel for your “on air now” messages, and then display or hide the on air now text on the screen.”

Like I said, it looks like that would work but I can’t even see how I create a channel or how I would display the message from a query result every hour and also not just subscribers but visitors who aren’t logged in.

I cannot afford a developer (fiver anyone?) and am trying to learn from various resources but cannot find a simple enough starting point.

Seems a lot of hassle for something so simple - update an image at front end.