How on earth are you suppose to remember the touch screen regiister at McDonald's?

ok now ii jus started workiing at mcdonalds and the fiirst thiing they put me on was regiister. and the thiing jus confuses me so much. then after break they put me iin driive thru takiin orders and ii got the hang of iit but ii stiill made miistakes, so ii was wonderiing iis there a way to help remember the menu by heart or iis there somethiing onliine to help me practiice takiing orders? because ii get confused a biit.