Yes, you can by using the Advanced post button, then adding the image through the Manage Attachments button.... but you can also use Google's Picasa in your Gmail account (it's under Photos in your Gmail through the web), then adding an image using the "Insert Image" button and inserting the link to the image.
Ok I got it. The problem I was having is I was trying to get it done by use the A/C app. I guess it dosen't have the advanced option. Thanks for ur help.