Upload your video on Vimeo or Youtube then copy that video's link and in the forum you would see "insert link" option then put the link there or you can even put the link directly in the forum. Example
CsBlackDevil Community [www.csblackdevil.com], a virtual world from May 1, 2012, which continues to grow in the gaming world. CSBD has over 70k members in continuous expansion, coming from different parts of the world.
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