You can change your class by changing Amulet, You can purchase one from the Necklaces and Pendants tab in the shop, When changing class you must also remove any equipment from the previous class.

Thanks

note certain equips can only be worn by certain class

how do u get rid of ur equipment

selling/trading... unless you are referring to unequipping then click on you character pic in top left corner of screen. then click on item.