How to make molds for concrete stairs?

Great question! Here are several methods, see which one works best for you.

https://youtu.be/ywd5n7L9lqI

https://bethepro.com/build-concrete-steps/

https://www.concretenetwork.com/step-forms/

https://m.wikihow.com/Build-Concrete-Steps

I remember when my dad taught us when we were teenagers, and he had us pour the steps to an area behind our garage. Those lessons served both my brother and I for a lifetime.

Inside Brick and Mortar.

Ken, Hi. You'll need to build a frame for your steps, with 2x4s. Make sure it's even, and and the bottom is level also. I don't know if you want to make a complete frame, or just the steps. Start from scratch, and make an entire frame.

https://www.youtube.com/watch?v=gpdMrbRHBLU

https://www.wikihow.com/Build-Concrete-Steps

https://www.google.com/search?q=diy+concrete+stairs&tbm=isch&tbo=u&source=univ&sa=X&ved=2ahUKEwik2IfX1vXcAhUKG6wKHS5fDkEQsAR6BAgDEAE&biw=1536&bih=739