Slider Section Setup in Avril Lite?

In WordPress Dashboard go to the Appearance submenu and click on Customize.

After clicking on customize you will in theme Customizer.

Here you have to click on the Home Page Section.

Here you have to click on Slider

In Slider Here you can Manage Content.

Go to Customize ->Home Page Section-> Slider

You have to use Slider Image Size 1920Px X 960Px

In WordPress Dashboard go to the Appearance submenu and click on Customize.

After clicking on customize you will in theme Customizer.

Here you have to click on the Home Page Section.

Here you have to click on Slider

In Slider Here you can Manage Opacity.

Go to Customize ->Home Page Section-> Slider