How do I attach a snorkel on my goggles?

Depends on what you have for a "thing". If there is such a "thing" with two "eyes", then stuck because snorkel only through one eye, of the "thing" on the inside of the headband down Mr. plugging through and put the other eye on the headband and the snorkel also inserted through the second eye. Then you have the snorkel yet only rotate so that you come with your mouth on the mouthpiece of the snorkel. (The snorkel should then be way outside of the headband). If in doubt, but you can mount the mask and snorkel for easy plug next to the mask through the headband.