I'm trying to follow this tutorial Animation Nodes Letter Wiggle There is created a node tree at minute 2:10 an after that it's added an Text Object Separate, but in the version that I have I can't find how to do that, because I don't know how to add the node tree and also the Add menu is different. Have I to install something? Thank you.
Welcome to blender SE. Animation Nodes is an addon that doesn't come with blender by default, so you need to download and install it first. Please check the installation guide.