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you cut out the fake vent making a hole smaller than the fog so you have room to trim it and make it fit as best as possible. Then you secure them in the hole using whatever method works best for you. Some people screw them in, some people epoxy them in.
Dude, i just use the screws ! Don't completely cut the out the vent, try to trim the vent accordingly to the shape of the foglights. That way, the remaining of the vent will give you more room to secure the fog in place with screws, at the same time provide cleaner look. If you have anymore question just pm me, i'll try to help as much as i can.
Ps. I took my car to the track and drove really really hard after the installation, the fogs are still solid stuck on there (knock on wood).