How to reference private instance variable in main.m - objective-c

Question

I am leaning objective-c, and as shown below in the code, I created an interface with a private instance variable section. In the main.m, a pointer instance variable was created as shown below. what I want to know is how to send a message to one of private instance variable? Something as the following:
[ptr->_address XXX]..IS IT POSSIBLE
2- and how to initialise the private instance variables using
[[xxx alloc] initWithxxx]……IS IT POSSIBLE??
main.m
MeAsImpl *ptr = [[MeAsImpl alloc] initWithCountry:#"DEU" andCity:#"KA" andAddress:#"xyzstrasse7"];
NSLog(#"chip:[ %# ]", ptr->_address);
NSLog(#"chip:[ %p ]", structChipInitializerSegment);
NSLog(#"chip:[ %# ]", structChipInitializerSegment->chipName.self);
NSLog(#"chip:[ %p ]", structChipInitializerSegment->chipName.self);
NSLog(#"chip:[ %p ]", structChipInitializerSegment->numOfTotalChannels);
.h:
#import "ProtocolKidsSchedules.h"
#ifndef MeAsImpl_h
#define MeAsImpl_h
#endif /* MeAsImpl_h */
#interface MeAsImpl : NSObject<ProtocolKidsSchedules> {
id<ProtocolKidsSchedules> _signee;
NSString *_country;
NSString *_city;
NSString *_address;
}
#property (nonatomic, retain) id<ProtocolKidsSchedules> signee;
#property (nonatomic, retain) MeAsImpl *owner;
#property (nonatomic, retain) NSString *country;
#property (nonatomic, retain) NSString *city;
#property (nonatomic, retain) NSString *address;
-(NSString *) signeeOfTheContract: (id<ProtocolKidsSchedules>) signee;
-(id) initWithCountry: (NSString *) country andCity: (NSString *) city andAddress: (NSString *) address;
-(id) initWithOnlyCity: (NSString *) city;
-(id) initWithOnlyAddress: (NSString *) address;
#end
.m
#import <Foundation/Foundation.h>
#import "MeAsImpl.h"
#implementation MeAsImpl
#synthesize country, city, address;
-(BOOL)areChoresCompleted:(BOOL)completed {
return completed;
}
-(BOOL)areHomeWorkCompleted:(BOOL)completed {
return completed;
}
-(BOOL)doDerserveCookies:(BOOL)doDeserve {
return doDeserve;
}
-(NSString *)signeeOfTheContract:(id<ProtocolKidsSchedules>)signee {
return #"Signee is: ";
}
-(id)initWithCountry:(NSString *)country andCity:(NSString *)city andAddress:(NSString *)address {
self->_countery = country;
self->_city = city;
self->_address = address;
return self;
}
-(id)initWithOnlyCity:(NSString *)city {
self->_city = city;
return self;
}
-(id)initWithOnlyAddress:(NSString *)address {
self->_address = address;
return self;
}
#end