RSI sound alert on mt4


I have a problem how to set up teh sound alert on my MIg demo accoun.
Somewhere i find a codebase, then put in in the Expert folder with the name “rsi alarm”…but when i try to drag and drop it from the navigator box in to the chart nothing happens except the message in the journal: rsi alarm is an indicator and cannot be executed.
What I did wrong?

Thanks in advance.