I think I did step one right but it won't run... I press the run button and M but nothing happens
(did I print screen and paste correctly? this link came up?)
It's not currently possible to see creatures in the vox-l simulator -- After making the mod (make sure it matches what you see in the screencapped instructions) , the badge should unlock. Would you try testing the mod in minecraft?
thank you - the video didn't say that!
It's a new development, unfortunately. It's better to follow the screencapped instructions posted below the video as it's very hard to edit videos after they're made and posted.