Hw to add bb codes button?
 

In my site i have installed hide hack and youtube hack but the buttons and not displayed in New thread Box..hw to add this buttons?

For the "Hide" mod you should ask in that thread for help, this is for general vBulletin 3 questions, not help with specific mods.

Same for the "Youtube Hack" but off-hand I've never heard of a "YouTube Hack" - If it's a YouTube BB Code you add it by including a path to a button image on the "Edit BB Code" screen in BB Code Manager in Admin CP. If you mean the AME mod there is no button because there is no code needed, you just paste in the URL and it works automatically- but again this is discussion best reserved for the thread of whatever mod you are referring to.