How can I add Sub-Menu Buttons?

[iorkara]

Hi everyone.
I want to Add a few Menu Buttons to the Sub-Menu. I need help with basically the whole process. Like, which file to edit and what code to use.
Your help will be very much appreciated.
Thank you.

[François Keller]

did you search the board before asking ? i guess not  see here http://forum.coppermine-gallery.net/index.php?topic=24107.0