Qu'est-ce que c'est?
Do you mean YABBC tags? Like the little 'Flash' button under the 'Bold' button when you try to make a post? If so, try the Board Discussion forum. I dunno.
I'd image you need to upload a swf file somewhere and point the tag to that (ie, put the url of the swf file between the flash tags, and give it a pixel size).