How do you change ross to a new class in fire emblem the sacred stones?

In "Fire Emblem: The Sacred Stones," to change Ross to a new class, you need to use a class change item called the "Hero Crest" or the "Knight Crest," depending on which class you want him to become. First, level Ross to at least level 10 as a Fighter. Once he reaches that level, select the appropriate class change item from your inventory and choose Ross to promote him to either a Hero or a Beserker. After the class change, he will gain improved stats and abilities associated with his new class.