script question

I am doing a Pong type game from a tutorial and trying to add a script to a sprite and I get this message -

Can’t addscript behavior VisualContainerasset. The script needs to derive from MonoBehavior!

Visual Studio comes up by default, I have it for Unreal, How do I work around or force Mono to run? can anyone tell me what do I need to do to make it work?

Good day.

You should look at this:

Bye! :D