1st Process:-

█►Upload any picture In your Album.
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◄►Then see it in full size.
◄►Right click on the Image and select "Copy Image Location".
◄►Come to Topic click on Reply.
◄►Right click in it click on Paste (Ctrl+V).
◄►Done...!

2nd Process:-

█►Go to your scrapbook.
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◄►Click on add photo icon.
◄►select your Picture using Browse.
◄►Now Upload ur Image in ur scrapbook.
◄►Then you will see a "URL Link" in Scrap Book.
◄►Copy that "URL LINK".
◄►Than Come to Topic click on Reply.
◄►Paste in Reply (ctrl+v).
◄►Done...!