Take a TRAM 6 towards ČRNOMEREC. The ticket costs 4 kunas (cca 0.50 euro), you can buy it from a driver. Exit at the TRG BANA JOSIPA JELAČIĆA station. Usually, there is an LED screen in the tram so you can track the stations. For the reference, you should exit at the fifth station (your station is “zero” station). Although in Croatian, maybe THIS will also help you.