Here is how I use a reflector.
First, I put it behind me. So the fire is in front of me and the reflector behind me. I put the reflector in a “V” shape and I try to sit in the center of the V. Heat strikes the reflector and is bounced onto my back.

If the wind is blowing, I put the whole arrangement so my back is to the wind. Then the reflector also acts as a windshield. Problem here is that it can also act as a “chimney” causing the smoke to move towards you. Depends on the situation.

Build a very small fire. Probably the smallest fire you can make and still keep it going easily. Keep the whole arrangement close together. Distance from fire to shield is just enough so that I can get in between them. Be wary of sparks. Space blankets melt/burn depending on construction.

I can support the space blanket with my walking stick. Only one post needed. The rest of the support is done with rope. But 3 poles are better and provides more room. Although the one pole system seems to take strong winds better but does not provide as much space for me.

I was gonna put a picture here, but I guess it has to be on the web someplace. Don't have time to figure out how to put the picture someplace so will skip that for now. Perhaps later.