In the Snowy Ridge/Cyan Boundary, to the left and up of the warp crystal, between two dragon statues there is a wall you can break. Watch the Shy Night Elf and Cunning Night Elf do the do, and after that talk to the guard below and to the right of the warp crystal. Hope it helps, sorry if it doesn't.
As you can see in this marked part of code, there is a control switch named "Blessing Code Check" and if that switch is on you can't use blessing code anymore. That switch is OFF on the start of game and switches to ON when you use this code
So... you can use this code ONLY ONCE
But don't be sad, in Guide which is pinned on main page of game in itch.io you have all advice and tips how and where you can find more Goddess Coin
