Let's learn to use the toolkit by creating a background for the stage.

• On the left side of the screen, find and click on it once. Notice the blue blocks that appear below.
• Find the block labeled Underwater. Click, hold, and drag it into the black space below, then release.
• Click Run to see your change appear on the stage.

To navigate the page using the TAB key, first press ESC to exit the code editor.