Should be a screw underneath the post

It unscrews from the bottom. Pretty sure you're going to
need to take the board it's on off to get at it. I'm not sure you're going to get a screwdriver under there.

The screws to remove that thing are in the corners. A couple are underneath the right hand edge of the bride's helmet, so you need to take that off too. It comes off pretty easy. There are screws around the outside of the helmet. Be mindful of the wires running to the lights.

Once you get the top off they're just regular screws holding the red posts in. While you have it off take the opportunity to clean and wax around the poppers and check if the rubber around the edges under there need to be replaced.

Sounds harder than it is. Just be careful putting it back together.