"Move the gems to the blank spaces to create a horizontal or vertical row of 5 identical elements. To move them, simply tap on the gem and then tap on the location where you want to move it. If there is an open path between the gem and its destination, it will move to the new location. Every time you move a gem and there is no match, 3 new gems will be added to the board. Do not let the board fill up too much or it could take up all the spaces and your spell will end."
Touch the gem and then the empty box to move the gem.