If you're supposed to go directely to your accomodation before the courses starts on Friday, you need to arrange with your hotel or the local you are staying with how and where too meet.
Arriving by plane
The Airport Shuttle stops right at the Stavanger Turnhall/Siddishallen, close to the Siddisstova where the classes and registration is located.
The trip should take approx. 15 - 20 minutes, depending on traffic.
NB: Does not accept cards, bring cash (app. 80 NOK, cheaper to buy tour-retour tickets)
By train or coach to downtown Stavanger
Both trains and coaches stops at Stavanger Central Station (Byterminalen).
From downtown to Siddisstova (Ungdomslagshuset)
There are several buses going from Stavanger Byterminal (Central Station and Coach Station) to Stavanger Turnhall (the name of the bus stop)
Bus 6 towards Sandnes, leaves from terminal 19
Bus 7 towards Sola, leaves from terminal 19
Bus 9 towards Sandnes via Sola, leaves from terminal 32
Bus 3 towards Viste, leaves from terminal 32
see bus station map and map over bus lines.