How to get B stunu (center pole) plastic?

I pressed too much when I wanted to wipe the top of the front seat belts. The cover, which covers the space where the arch height adjustment was made, migrated from the top. This piece is under the plastic cover that says airbag inside the B-beam. Cover that slides up and down the belt when changing the height of the belt. It was as if he was off track. For this reason, we cannot slide the belt upwards, it hangs.

I could not find the way to pull this cover out. Because there is no place to hold on the edge. So I thought of removing and fitting the B Stünu plastic. At least, if I could call it from above, it came as if I pressed it with a thin thing. I tugged a little, yawning, but it was not enough to spend, I was afraid to push. I would like to take the thoughts of those with experience. I hope I could tell.

There was no comment, but I succeeded in my second try. Let me try to explain it if it happens.

I hadn't thought of removing the door wick. When I removed the rear door wick from the top corner, the gap widened, I was able to stretch the plastic coating inward with my hand and see the cover from there. But I could not press it by hand, it is too narrow and the sides are sharp. I was able to insert a pencil and press it with it. However, as soon as you press it, it does not fit easily. It was a bit difficult. Since the pen will now hold the coating, release it and hold the belt buckle (what I call buckle; where you adjust the belt height). Because, on the one hand, while pressing the cover with a pen, on the other hand, it is necessary to slide the cover by bending the belt buckle from right to left. You can slide the cover towards the front of the car, place it on the back rail, then slide it back and sit on the front rail. Here's a bit of a mess here, but eventually it happens.

Thanks for your explanation.