I do not have Metatrader on Android (I do not like Android sorry)...
but as far as I know - this is mobile version of
Metatrader, and there is no any custom tools (indicators/EAs/scripts) on mobile Metatrader.
You can look at this site for more information: https://www.metatrader5.com/en/mobile-trading/android/help - for example (this quote is from this site):
-
Indicators – to start working with indicators on a chart, tap button
on the top panel or in the radial menu.
So, I can not help ...
I hope someone (who is using it on Android) will help more.

MetaTrader 5 Android Help
- www.metatrader5.com
MetaTrader 5 for Android powered devices is a platform for mobile trading on the Forex and stock markets. The application allows you to connect to a broker's servers, receive prices and view price charts, trade and view the history of your trade operations. This is available from anywhere in the world absolutely free of charge! With the...
Okay i got it
Just tap on the graph then the "F" icon appears on the wheel of timeframes

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Hello
I a m using Metatrader 5 on Android system
I can't add indicators on the graph, the icon "F" to add indicators is not present !!
I tried to reinstall MT5 this is not better
Help please