1. Open the World of Warcraft game and make sure the Bigfoot plug-in is installed and enabled.
2. In the game interface, click the plug-in button in the lower right corner of the screen (or press ESC to select plug-in management).
3. In the pop-up plug-in management page, find Bigfoot plug-in and click Open Settings.
4. On the setting page of Bigfoot plug-in, find the related setting options such as "Chat" or "Channel". There may be an option called "channel filter", "channel mask" or something like that.
5. Check or set the related channel blocking options to add hostile channels to the blocking list. Usually, you can choose to block all hostile channels or manually add specific channels.
6. Save the settings.
7. Reload the plug-in (if necessary) and return to the game. By now, you should have successfully blocked messages from hostile channels.
Please note that the game and plug-in may be updated, and the specific operation steps may be slightly different. If you have the problem of blocking the passage, please consult the documentation of Bigfoot plug-in or ask for help in the official forum.