How to add Jar libraries to an IntelliJ Idea SBT Scala project? -

I have described an IntelliJ Idea SBT Scala project.

I want to add Jar Library to use in this project. how to do this? Just do not help them in the project / lib if I right-click on "external libraries" in the project tree of Idea, "New" is gray.

In the intelliJ idea window of your project, found for file >> project structure >> libraries. After clicking on the option of those libraries, two pan will appear On top of most pane on the left, click the green "+" button.