Hello. If you have uploaded a photo, then it will be in your 'manage attachments' window. Reply to your own thread by choosing the "go advanced" reply button at the bottom right of the page. Here, you will get the advanced editor. Click in the message, then click on the paper clip icon and then in the pop-down, you should see the name of the photo you uploaded (if indeed the image has been uploaded). Select the image and it will be inserted into your reply.
Also check out the link in my signature below on posting photos.