wizopizo: Indeed there is a bug that makes it so that embedded youtube videos don't display correctly in the Tutorials when using FireFox.
For informations about making a title screen/menu you can also check my Asteroid clone in less than 100 events tutorial (written content, available capx, game in the arcade).
Also if you use the "Edit post" option from the dropdown menu "Post options", you can avoid double posting which is always nicer in forums.