The error is telling you what is wrong and on what line(9) and column (5). Here’s the docs. As you can see, it’s lowercase “b” so “Rigidbody2D”. C# is case sensitive. I’m actually surprised Intellisense doesn’t present you with it correctly.
Also, you’ve put a “FixedUpdate” method inside another method “Update” which is wrong. They are separate methods.
It’s also easier to post code as text and not images by using CodeTags .
Note: There is no such thing as Unity 2D. 
Hope that helps.