I’ve tried to overlay the RSI on the price chart but it doesn’t work. Seems ProRealTime has no such feature which many other brokers software have?
You’d need a secondary scale (which PRT hasn’t got) as RSI values are from 0 to 100.
But you can display some of the the RSI related Indicators off this site on the Price axis.
Example here …
https://www.prorealcode.com/prorealtime-indicators/rsi-overboughtoversold-bands-price/