First you have to plug textureObjects into the slots. (when you drag a texture into the editor, you can rightmouse click and convert it to a texture object. )
I would first start from here and see if you can get the triplanar aka world align working without any fancy side effects. Ones you know the node, start adding additional float nodes to control contrast and al.
You also may have to plug a vector3 node to the scale input of the node to tweak the tiling of it all. It is indeed called ‘complex’ for a purpose
to get some results, plug the XYZ output to diffuse or whatever you need. (e.g. normal)
At this point you still have a basic crossfade between the edges but of you get the node working so far, you at least have something play with and start adding stuff to it. Such as the advanced heightblend lerp feature that comes with it. It is worth figuring this one out. (at least it did for me)