there is no seperate UI. get the yafray installer. install it and add it’s directory/folder to your path. it explains it on their site.
If it is installed correctly you get this;
This is the option panel open

Now before anything will render here are a few things to remember.
You must have lights in your scene for anything to render. If not you’ll just get black.
It renders from the POV of the camera you are looking through.
in the option panel camera height and width is the size of the final image.
the other options you can play with to tweek the final image.
Jay


