You can change your Investor Password by following these steps:
1. Open the MetaTrader 4/MetaTrader 5 platform and click on "Tools" in the menu bar.
2. Select "Options," then navigate to the "Server" tab.
3. Click "Change" next to the Password box.
4. In the pop-up window, enter your current password and click on "Change investor (read-only) password."
5. Enter your new investor password and confirm it.
6. Click "OK" to complete the process.