in palce of these can i add more options like megavideo, google video, videobb,..??
Don't think thats possible. Sorry.
As Sanket said, it's not possible. But that doesn't mean that you can't use the embed and HTML codes of the video. Simply grab the embed code from Megavideo and / or the HTML code from Videobb and you will be able to post it and watch it on your forum. Here is a tutorial on activating HTML if you need it: http://help.forumotion.com/t35636-enabling-html
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