How to change MT4 Password in MT4
Click on “Change” button in the Options window
It will open “Change password” window.
As you already know, you need the master password to change the read-only password.
Enter your MT4 master password in the “Current password” field.
Then, select the “Change investor password” option. Be careful here. If you choose another option, then you’ll change the master password.
And finally, enter a new password twice.
Click “OK” button to change the password.
If the password is changed, this window will disappear.