The first method, right-click in the desktop space, and select display settings.
There are many options on the left side of the Setup Panel, find and click "Default Application". As pictured.
There are a lot of default settings to choose from, pull down to see the "Web browser", click on the system can be selected after the browser has been installed as the default browser.
The second method, is in the antivirus protection software settings, small set here with the TX computer Butler for demonstration, other anti-virus protection software operation should be similar. Open the computer housekeeper, find and open the Toolbox
Choose browser Protection in common options if you don't find browser protection, you can set it up in your customizations.
After you turn on browser protection, I believe many people already know how to set it up.