How to make this: ?

Hi guys,
I have 2 questions:
1.I want to import a image in unity,and when i export in exe file and start the game this picture to go in full screen,but i don’t know how to make this.Plase Help
2.And the second qusetin is how to change the scenes automatically(from 1scene after 20sec to chenge in scene 2 without pressing buttons)
Thanks in advance

1a. Drag the image into the project window in Unity.

1b. Use OnGUI, look at the reference

2a. Application.LoadLevel (check the script reference)

2b. Use coroutines or check Time.time

I can’t drag the image in Unity
And why nedd OnGui?

I cant drag the image in Unity.And why need me OnGuy?