When you arrive in Sheffield
A printable map is here - the Student Union Building is at the centre of the map in grid E3/4.
From the railway station, take the blue route tram towards Malin Bridge and get off at the stop "University". Trams run every 10 minutes, travel time is about 10 minutes, and you can buy a ticket straight from the conductors on the tram who walk through. It is a short walk uphill from there. Or just hop into a taxi - it should cost around £7.
On arrival at INOX, you should see Sheffield team members in blue T-shirts who can point you in the direction of the reception desk.