Please have a look at this article with a video that we also shared on email when shipping the scooter: How do I fold and unfold the Wolf Warrior electric scooter?
In order to remove the pin, try to put the scooter up on a box to alleviate pressure from the front wheel. you can then move the front stem while you try to pull out the pin. Also, try to play with the red main folding lever as that one is also held down by the bent pin.