change system tester for these cond'n

hi...i usually run metastock exploration to find signals & system tester to test it...
but if everyday eod, i run exploration & place order for tomorrow when market opens....but i observed tht while running system tester it normally accepts order with todays price..but actually my order is executed on next trading day...


need to modifiy metastock system tester so that if buy signal is generated today then it should consider next trading days opening price for buy....& same should happen for sell also...

can anyone help.....