Come out into Kansai airport arrival hall, at the centre is a tourist information, show your receipt there to claim the ticket.
If it is JR Rail, then have to exit the arrival hall, cross to next building in front and JR Office is there.

Try calculate the cost if 1500 yen is worth daily pass or not, depending what area/places you want to visit. For me, my average daily transport is 600-900 yen only if within the city itself. I'm using ICOCA card.