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Do you get any error message? Can you please share a screenshot how the page is displayed for you? The following guide should help you how to upload image in forum post: http://www.jotform.com/answers/277033
I would suggest you to also try to clear your browser cache and see if that solves your problem. The following guide should help you how to clear your browser cache: http://www.wikihow.com/Clear-Your-Browser's-Cache
We will wait for your response.