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Use a photo-hosting site (like Photobucket or others); upload your photos there & take the IMAGE URL (copy & paste) of a particular image of yours from THAT site and paste it into the 'Image URL' box found under the 'Insert Image' icon in the post/type composition box.
I'll give it a try... If you notice the icons right here above the window you type in... there will be one that says "Image" when you mouse over it.. It's between The Film clip and the Paper clip... Click on that and then you click on "Browse Computer" (you have to have the pic you want loaded onto your computer).. then you browse your pictures until you find the one you want and then double click the picture... The URL should have loaded into the box and all you have to do is submit it... Hope this helps
PS. make sure you go into your profile and click on "edit account details"... scroll down to "preferred editor type" and chose "BB code editor"