Crab? Crab!

What a beautiful and sunny day! You finish your work early to catch up on your son's birthday party and buy him his favorite meal, the boiled crab. Everything goes on the right track, it seems like a perfect birthday for him. However, the problem comes when you try to separate the crab. You've been trying so many times but still do not remember the steps. It annoys you. Therefore, this time, you decide to document the steps clearly and publish them to help everyone who tries but fails to separate a crab. 

Now, follow the steps and give your son a perfect birthday!!