Here you will find documentation on:
-Installing libraries into the Arduino IDE
-Including libraries into a Sketch
To install a new library into the Arduino IDE:
Once you have opened the Library Manager you can use the menu in the top to filter the results.
Now your library is installed. In order to use it, you need to include it in your sketch.
Once you have installed a library, you need to include it in your sketch in order to use it.
Now the Library is included in your sketch, and you can use it in your code.