How do you set a wallpaper on your desktop if someone has blocked it?

If someone has blocked the ability to change your desktop wallpaper, you can try accessing the settings through the Control Panel or System Preferences, depending on your operating system, and look for personalization options. Alternatively, you can check for group policy settings if you're on a Windows machine, as an administrator may have restricted changes. If you have admin access, you can modify these settings; otherwise, you may need to consult with the person who set the restrictions. Lastly, using third-party software may help, but ensure it complies with your organization's policies.