umm save your picture on your desktop then sign up for a photobucket account (click photobucket) then after that click my album then click upload image when it is uploaded click one of the links below the picture to copy it then on a sythe post click the picture of a mountine on message toolbar then paste the link.
Hope that helps if not explain more what you want done. as in what type of picture it is.
go to photoshack.us its easier and u dont have to sign up to no account when your on the site click browse selecting ur image and click the host it button