Ater successfully login to Facebook, you can get list FanPage by requesting @”/me/accounts” and iterate to the fan page you want and request its accessToken by making request to @"/FBFanPageID?fields=access_token"
This accessToken is different from your facebook.accesstoken .
After getting fanPage accessToken, set it as facebook accessToken by
[_facebook setAccessToken:_accessTokenForFanPage];
// this is necc step
Now you can upload to fanPage wall by @"/FBFanPageID/photos"
Request fanPage albums by @"/FBFanPageID/albums"
Upload to particular album by @"/AlbumsID/photos"
For uploading these image param dictionary will be used.
NSMutableDictionary *params = [NSMutableDictionary dictionaryWithObjectsAndKeys:
IMAGE,@"source",
IMAGECAPTION,@"message",
nil];