What exactly do you mean when you say "pictures I send are coming up in his name" ???

I'm guessing here that you mean the computer operating system is still set up with his name. If so this should be fairly easy. and I can show you how;

1) Click START on the tool bar and click on the picture at the top next to the name;



Then, you might get this screen;



If you do, just click the CANCEL button and you should see this screen;


]
Then click the CHANGE NAME (first option) and you should get this;



All you need to do is put your name in and you should be sorted