If you have received a place, you will learn here how to accept it in this here.
If you applied for a degree program with more than one subject, it is possible that you only receive a place for one of the subjects.
Example: You applied for the two-subject Bachelor program Geography and Music but have only received a place for geography. If you have applied for another two-subject degree program in addition to geography and music and also received a place for one of the subjects, you may combine the applications.
The process is explained here (Combine admitted subjects).