No need to be sorry! It is quite confusing!
On the left of the screen (or on the right for player 2) there is a list of recipes. For each recipe there will be two or three icons that show you what ingredients have to go in the cauldron to make that recipe. If an ingredient has to be chopped before you put it in the cauldron, there will be a knife icon below it. If an ingredient has to be smashed before you put it in the cauldron, there will be a hammer icon below it.
I hope that helps? If not don't worry! Thanks for trying it out anyway and for the feedback :D