How do you send pictures on Samsung Galaxy s3?

In more detail itd be So I just got the Samsung galaxy s3 and I csnt sent pictures the person I want to sent it too does not have a Samsung phone they have a blackberry or any other phone When I attach a picture to my message it says its going in as a slideshow then when I press on the picture it takes me to another screen where the slideshow is playing Its 5 seconds and it just shows my picture It wont sent because the file is too big. Please help