To be able to change your password on MetaTrader on your Android smartphone or tablet, you will need to follow the below steps.

Find the menu tab on the MetaTrader application on your Android and tap on it.

On the menu tab, tap on Manage Accounts.

On the Accounts list page, tap on the account options icon and then, tap on Change Password.

Choose Change Master Password in the first selection option and continue the procedure by typing your current Live MetaTrader account password. In the options below, type your new Live MetaTrader account password and type it again to confirm this change. Lastly, tap on Next.

You have now changed your Live MetaTrader account password on your Android device. Tap OK on the following screen to finish.