Hello Azlan
MT4 does not have this feature yet other platforms do. What you can do in mt4 is just use MACD or Stochastocs or if you want a MA for the RSI apply it on the Median price/ Weighted price or Typical close, which will create a mini MA for RSI (using Highs/Lows/Close as it main parameters) adjusting your time frame in line with your needed parameters.
Another option is just draw trend lines on RSI (adjusting your time frame in line with your needed parameters.)