I am using blender for an online game (Roblox) and they only allow you to use one image for textures.
I made a rock mesh, with a pretty good texture and some nodes that make it look great, but without the nodes and texture it looks horrid.
Mesh + Textures + Nodes in Blender

I looked up how to export textures but nothing seems to work.
I tried UV Unwrapping but (im a noob) and keep getting stuck on this...
(This is in UV/Image Editor)

I tried most of the answers on this site, but then this happened in the game...
UV Unwrap

Wrap up; How do I export Nodes, and Textures into one image