Can you send a picture saved to computer to a cell phone through yahoo im?

You can try - but it probably won't work. The cell phone must have the capability to access the internet, AND the service plan for that phone must allow it to access the internet. On top of that - Yahoo Messenger Mobile must allow it - and that's where I think you'll run into problems. Another option ... Have the person with the cell phone send a text message to your email address. (Instead of entering your phone number, he/she can enter your email address instead.) When you get that email/text message - the reply to address should be unique to that cell phone. Assuming the cell phone can access the internet, all you should need to do is email the phone back with the picture. I can't guarantee it will work (different phones and services work differently) - but it might be worth a try.