I'm new to blender. How do you change the render engine?
According to this video, the button should be along the top. I've searched google, and the blender documentation with no luck.
For version 2.8
Use the render properties section of the scene editor.
There you can find the options that are available in your particular version.
For versions up to 2.79, you need to be on the info window
then select your render engine
Note that blender internal and the game engine have been removed starting with version 2.8.