i use photobucket which is free to put my pictures on the web. thier is other free ones but photbucket is about the easiest i have found. here is a link the site is totally free
http://photobucket.com/ once you have your photos uploaded then just copy and paste the image img code here using the insert image icon which is the one that looks like a post card in the reply and new post area on the same line as where you make bold print and things like that