First thing is you need to know is where the file/picture is you want to send ie:
P:\Windows Common Profile\My Documents\My Pictures(Name of file)
Create the email and somewhere up the top you should have a paperclip symbol.
Click on it and it will come up with a browser, find your why to where the file is and hit OK.
It will attach in an attachment window and will need to be opened from there for it to display.