Your link doesn't work for me but I think I can help anyway: After you selected Singelplayer, try click the tram-pic on the left side of the menu. Then you should've the same menu in front of you as Kira showed in her screenshot. Now click the top drop-down menu on the right and select IBIS_BerlinTram (or default).
Hope that helps.
Edit: Damn you Steven 
