ok - to the lower right of the reply/dialog box you should see Post Reply, Upload Photos and More Options - - click on Upload Photos.. this will open a new window that you use to "surf" your system to find the pic you want to post.. keep surfing 'til you find it -- (best bet is to know the name of the file and type it into the File Name area at the bottom of that window) - once you have found it simply double click it like you would to open most files and it'll "self populate" and take you out of that window. (the "trick" here is knowing where the file ended up when you first saved it)
Now you should see the image below the reply box to the left side under Insert Bookmarks - it'll say Full Image in a clickable box - go ahead and click that and it will put the image into the reply/dialog box.
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