Honestly the easiest way to get to the course is by car.
Just type Disc Golf - Lila's into Maps and you should arrive at the designated parking lot of the TCS Radmer. From there you have a 5' walk to the begining of the course.
Alternatively you can take the tram nr.10 from Basel and go till Flüh. From there change to the bus nr. 69 till the station Mariastein, Abzweigung Rotberg. After a short walk of around 200m you arrive at the tee of Nr.7 and can start the round here.
But by far the nicest way is to grab your bike and enjoy the beatiful surroundings on the way to the LILA DISC GOLF course ;)