How do i access the nodes for text in blender?

I was looking for a way to animate text in blender, i found a way but the way it was done used nodes involving the text object, how can i access this set of nodes?

here is my blender screen: (don't pay attention to what i'm doing)

Solution

The first image you found shows nodes from the Animation Nodes addon. Note that current versions contain compiled code, if the pre-built releases listed don't match your system you will need to build it yourself.

You may want to try a simpler solution first, the Animated Text addon offers several text animation options.