Blend surface command

Hello! I am a rhino beginner. And I faced a question today while practicing random stuff. What I wanted to do is to make a spontaneous curved surface between these two surfaces.

  1. I made rectangle and circle
  2. plansrf - split each curve into 4 parts
  3. command blandsrf to creat curved surfaces.

But it seems like I am not doing it in a right way. Does anyone know what is the proper way to make the type of curved surface that I am trying to make?

ps.when doing blendsrf command, the control points always twisted and created tangled surface. Why is this happening? Hoe do I prevent/adjust it happening? I hope it works the right way from the first hand!