Open up AOL or Yahoo, go into "create an email" or whatever the option is.
There will be an option for adding an attachment. It may be shown with an icon of a paperclip.
When you select this it will give you an option to "browse" for the file.
Go into your documents folder, find the photograph, then select it.
This should take you back to your email window where you can write the text, add the address etc, then send it.
The photo should be sent with the email.