Basically, you cut/saw it off above the top ring of the spiral part. I used a hacksaw blade because I had an extra one in my dad's woodshop, but a pocketknife will do.

Once you cut it off, you'll need to bust through the glass to get into the chamber; a bic pen can do this nicely.

I love my lightbulb vape;the amount you have to smoke is comparable to a bowl, and the high is a lot more like the kind you get off of brownies. It's also very chill, because it doesn't smoke/smell up your room. Enjoy!