In Windows 10 system, the method of adding whitelist depends on what whitelist you want to add. Here are some common ways to add a white list:

1.Whitelist of Windows Defender: If you want to add files or folders to the whitelist of Windows Defender, you can follow the following steps:

-Open the Windows Defender Security Center and search for "Windows Defender Security Center" in the Windows search bar.

-Select "Virus and Threat Protection" in the left menu bar.

-In the right window, select "Virus and Threat Protection Settings" under "Management Settings".

-On the Virus and Threat Protection Settings page, scroll down and locate the Excluded Files and Locations section, and then click Add or Remove Exclusions.

-In the pop-up window, click Add Exclude, and then select the file or folder to add to the white list.

2.Windows Firewall Whitelist: If you want to add an application or port to the Windows Firewall Whitelist, you can follow the following steps:

-Open the Control Panel, enter "Control Panel" in the Windows search bar and open it.

-Select "System and Security" in the control panel.

-On the System and Security page, select Windows Defender Firewall.

-Select "Allow applications/features to pass through Windows Defender firewall" on the left menu bar.

-If you want to add an application to the white list, you can click the "Change Settings" button on the "Allow Applications/Features to Pass through Windows Defender Firewall" page, and then select the application you want to add. If you want to add a port to the white list, you can click the Add Port button in the Allowed Ports page, and then enter the port number to be added.

The above are several methods commonly used in Windows 10 system to add white list, and the specific operation may vary according to personal environment.