I use a plastic bucket to ferment in but the process is the same.
Remove airlock from top. Clean and sanitize grommet/airlock hole. Insert sanitized tube end into grommet (a 1/4 inch insertion will do). Fill a tall cup with one cup of water, insert other end of tube into water cup. Cup should be on the floor.
This will allow extra pressure to release and provide an exit for liquid stuff should it blow. Ensure that one end stays in the water as you don't want bacteria or bugs to crawl up your tube.
After a week or so I just put the airlock back on.
Primary: Tripel Trouble
Bottled: Abbey's Weiss, Betty's American Wheat, Das Boot Kolsch, Coffee Stout w/Cocoa Nibs, Coffee Stout, Imperial Amber Ale, West Coast IPA, Nelson Sauvin Session Amber Ale, Belgian Golden IPA, Ya Mama's Best Milk Stout