Hint from the game instruction manual "Clues from the queen" page:
"A horse that's free to move might need some m-oat-ivation."
We have just finished producing the print files - Sorry about the delay! /Dennis G
(Also if you want to spoil your fun, there are some youtubers who show the way to do it. (Though I would recommend looking for it yourself as part of the exploration, but you're the boss of you. :)
It is not complicated once you figure it out. You just need to find an item and walk over it to collect it. - Thank you for playing!