How to instantiate elements on UI

Hi. I am quite new with Unity 3D and c#. I am still trying to find my way. The manual is really not helping, it looks it was created by people who knows Unity for people who knows Unity and don't look for answers.
You now understand I am looking for a step by step answer for starter, not these answers from IT to IT.

So, my problem is the following. I am looking for a complete step by step noob answer on how to instantiate different elements at random position in a panel on a UI giving the...

How to instantiate elements on UI