Oh yeah for sure lemme clarify! You're going to roll a die before every miracle you perform. 1 "Round" of the game is the loop of "Roll the die, choose a miracle, perform the dice effects or text on the miracle to advance fiction, then move onto the next roll." Every miracle you perform should have a die roll associated with it.
In terms of The Map, there's a far more popular and better designed game called "The Quiet Year" that was the inspiration for this game. Effectively, you use a deck of playing cards instead of a die and prompts for each card to interact with the map. Honestly, you might try playing that before this to get an idea of what the Map is supposed to be doing? They have this quote on their webpage: "part roleplaying game, part cartographic poetry." Cartographic Poetry is such a difficult concept to get across, but how I personally use it is to come up with a backstory for a world I want to play fiction in? Basically using a game to create a world for another potential game (or just the meditative activity of worldbuilding with rules for randomness).
Anyways, all that is to say that you're super justified in your confusion! Hopefully that sort of helps?