you need to gotten 2 elements. Earth,Fire
you can get it in lake hylia i think so.
If you want to
Use the oricana of winds to go to the lake place. become a minish and talk to the little dude in the mushroom house. He will say stuff about the library. go back to the town and the library will be open
zelda the minish cap
You need to get the flippers.
You have to get the power bracelet.
you dont get a shovel in minish cap you get the mole mits which let you dig also in the wind ruins.
in the temple in the sky
Play the game.
minish cap
in the library.
http://sfc.pokemon-inside.net/news-387 Soon you'll be able to edit Zelda - The Minish Cap using this Editor. greetz MX