Simplify Theme

Hi Guys ,I am very new, I got wordpress an I instal Simplify Theme , at the front page there are two womaen Picture and on the top of the imge it says Welcome to the creattivity, I am trying to delete the original two womaens picture and to put the imge that I want to ,but i can’t chenge it. any help or is there any tutorial for Simplify theme ?I realy appreciate your help.
THANKS