You don't need any codes. The Flash BBCode comes with phpBB. It needs to be enabled in the ACP, General tab -> Post Settings -> Allow use of [FLASH] BBCode tag in posts:
Once enabled, the bbcode will display above the message input box along with the other bbcodes like it does here on phpbb.com
Press the Flash BBCode button and you will see
Then you enter the width, height and url.
Code: Select all