I can’t see to render my thing I made. I don’t know where it is. I’m able to build it but I can’t render it like you can do in terragen…
No, worldmachine is not a subsitute for terragen. 
It just displays a colorful and cheerful nice-looking preview of what the built terrain looks like.
Using the output device, you are able to write it to disk.
Then, you’re free to use what ever software you want on it… Terragen is a good thing to render it… I believe most of (if not all) the images you see of terrains made using WM are rendered in terragen.
how do you save the wm file and open it in terra gen?