Ok and how this person do this he say he use essential and I thought chestshop,you have to use chest and a redstone
You can do that with Essentials using nicknames If I'm not mistaken that's an admin shop, which means it's an infinite supply of items and, thus, doesn't require a chest.
I told you that it's done with nicknames. Use the 'get plugins' tab on this page to search plugins. We can't sit here and hand hold you to your answer, unfortunately. You're free to ask a question, but searching and reading documentation is your responsibility, not ours.
Essentials is the plugin, nickname is a feature of essentials. ChestShop is the plugin, adminshop is a feature of chestshop.