How to remove the safety handrail of babyruler stroller?

When you lift the seat cushion in the back row by hand, you will find that there are two places that are particularly tight. Pull up hard. There are two clips in the groove below. Pull it out and push it back as a whole, so you can lift the condom as a whole without disassembling it.

Next to the two guard plates, a nut can be seen after the cushion is lifted. You can push it up after releasing it. There are two clips in it. Just push it up all the time, but it's not easy to install. You must insert the following clip first. I really don't understand. I will send you a photo.