How to insert data to Mobile Services - iOS / iPhone (Windows Azure)

-(void)addItem:(NSDictionary *)item completion:(QSCompletionBlock)completion
{
    // Insert the item into the TodoItem table and add to the items array on completion
    [self.table insert:item completion:^(NSDictionary *result, NSError *error)
     {
         [self logErrorIfNotNil:error];
         
         BOOL goodRequest = !((error) && (error.code == MSErrorMessageErrorCode));
         
         // detect text validation error from service.
         if (goodRequest) // The service responded appropriately
         {
             NSUInteger index = [items count];
             [(NSMutableArray *)items insertObject:result atIndex:index];
             
             // Let the caller know that we finished
             completion();
             
         }
         else{
             
             // if there's an error that came from the service
             // log it, and popup up the returned string.
             if (error && error.code == MSErrorMessageErrorCode) {
                 NSLog(@"ERROR %@", error);
                 UIAlertView *av =
                 [[UIAlertView alloc]
                  initWithTitle:@"Request Failed"
                  message:error.localizedDescription
                  delegate:nil
                  cancelButtonTitle:@"OK"
                  otherButtonTitles:nil
                  ];
                 [av show];
             }
         }

     }];
}

- (IBAction)btnSave:(id)sender {
    
    // Add Data Table Service
    NSDictionary *item = @{ @"username": txtUsername.text,
                            @"password": txtPassword.text,
                            @"name": txtName.text,
                            @"email": txtEmail.text,
                            @"tel": txtTel.text };
    [self.memberService addItem:item completion:^
     {
         UIAlertView *av =
         [[UIAlertView alloc]
          initWithTitle:@"Request Success"
          message:@"Register Data Successfully."
          delegate:nil
          cancelButtonTitle:@"OK"
          otherButtonTitles:nil
          ];
         [av show];
     }];
}