Instructions
Launch "Roblox" from your Web browser and log onto your account.
Click on the "Tools" tab at the top of the screen.
Click on the "Explorer" tab in the tools window.
Click on "Lighting" in the explorer window. A list of various backgrounds will appear in a new window. You can choose from daytime or nighttime, starry or sunny, and many other options.
Click on the background templates you would like to add and then click "Save Changes" when you are finished.