How to import a library on the Arduino IDE 1.8.x

If you are using the Arduino IDE 1.8.x and you want to import a library then follow these steps: 
- Download the library. 
- Open the Arduino IDE 1.8.x
- Select Sketch>Include library>Add .ZIP Library...from the menu.
 Import library1
- Select  the Zip file of library and click on Open
  Select file zip
- Wait the confirmation message on console. 
 confirmation message
Now that you have imported the library, you can use it in your sketches.

If instead you want use  the examples of the new imported library then scroll the Examples list from File>Examples menu, as shown in the below image:
example library

To include the library in a sketck, you need i:
for example if you include the Lucky library:
#include <Lucky.h>