Computer How To Transfer Computer Pictures To Cell Phone?

How to transfer computer pictures to cell phone? - computer

I have a MacBook and I want my pictures are on my team will be on my Motorola RAZR 2 V9. I have a memory and a memory card adapter. When I put the card into the adapter, the computer recognizes it. And the pictures I have on my phone, can be transmitted to the computer without any problems. But the images on my computer does not go on my phone. Everything you see is a large "X" on a black screen. Am I doing something wrong? The telephone company AT & T.