I am looking to add alerts to the simple RSI indicator, can any Guru on the platform help me add alerts to the indicator?

I downloaded the Indicator from the MQL5 codebase, I changed its name and added 20 and 60 RSI levels, and also changed the name of the indicator. What I am looking for now is to get alerts at
When RSI closes >60
When RSI closes >80
When RSI closes <40
When RSI closes <20

Please help me add alerts, it will make my trading strategy easy.