To go from Lund Central station to Scandic Star by bus you can choose between:
Yellow Regional bus no 160 or SkåneExpressen 5
Green City bus no 3
The ride takes 11-13 minutes and a one way ticket cost 28 SEK.
See Skånetrafiken for timetables
You can buy the ticket in Skånetrafiken app, or in the ticket machines at Lund C before you start your trip. For information on card payment on the bus: https://www.skanetrafiken.se/biljetter/kop-biljett-utan-app/ (in the upper right corner you find a globe with the text Translate).