Change your password
To change your password, login to your MetaTrader 4 platform and proceed to the menus which run across the top left of the platform.
Click Tools then scroll down to the Options tab.
In the Options window, select the Server tab, enter your password if it's not already there, then click on the Change button.
The Change Password window will appear. Enter the current password followed by the new password, then confirm your new password. Click OK.
Finish by clicking the OK button in the Options window.