The interface needs some work if you're not familiar with block based programming environments. Dropping things in place is a bit difficult compared to Scratch or Snap.
> Some blocks I can attach to the bottom of "run this program" block and they clearly run.
The blocks with a square side are commands you can attach to each other to make a program. The round blocks go in the round slots on other blocks.
> The screen is two dimensional so I was expecting to be able to put processing blocks anywhere. Sure I can but they do nothing.
You can click on them to run them without them being connected to a "run this" block. Whatever has a yellow outline is running.
> Some blocks I can attach to the bottom of "run this program" block and they clearly run.
The blocks with a square side are commands you can attach to each other to make a program. The round blocks go in the round slots on other blocks.
> The screen is two dimensional so I was expecting to be able to put processing blocks anywhere. Sure I can but they do nothing.
You can click on them to run them without them being connected to a "run this" block. Whatever has a yellow outline is running.