how do you use the letter not in the grid for the bubble pop on alphabetty saga?

froggrl202

how do you use the letter at bottom of the grid in the game for bubble pop. 

StuckInATree

The way to do is first by making four letter words, it will reward you with a crown and will be placed on one of the tiles on the board. What you need to do next is use that crowned tile in a word in order to activate it. Once a crown tile is activated, it will always help you with you current objective, be it bringing the cheese to the bottom or popping the bubbles, they come in extremely useful and are vital in order to complete some levels.