I saw a couple of errors:
  #import "RadioStations.h"
 .....
// Change newName to name. (like in header says)
// Change this  - (NSString*)newName{
- (NSString*)name{
return name;
 }
......
- (void)setFrequency: (double)newFrequency{
frequency = newFrequency;
}
// This must be delete }
@end
solved Beginner: Objective C errors in XCode