iOS deletion problem

hi ,goodmorning i have stuck with a problem and it is regarding plist .i have created plist in documents directory and i am able to read it but i donot know how to updated it and along with that i want to remove data from it .any suggestions from u guys is really helpful.thanks a lot.


BOOL removed= [fileManager removeItemAtPath:[self sts] error:&eror ];
here removed is diplaying yes but plist is not deleted from documents directory