How to install an application from archlinux.org

I am trying to download IntelliJ IDEA application from the AUR. I can see that is on archlinux.org [here](https://aur.archlinux.org/packages/intellij-idea-ultimate-edition) . However when I type in sudo pacman -S intellij-idea-ultimate-edition I get error target not found : intellij-idea-ultimate-edition How do I install this package from AUR? What am I missing?