Creating custom template

The description for this plugin says that I can “[customize] Menubar templates [that] can be moved into an independent folder, so [I] can upgrade to a new Menubar version without losing [my] changes.” I’m trying to do this, but it’s not working out. I have duplicated the superfish’ template folder and renamed the new one ‘my_menubar’. After doing this, ‘my_menubar’ shows up as an option under the Templates drop-down when editing my menu, but after selecting it and then reloading my webpage, I get “WP Menubar error: Function wpm_display_my_menubar() not found!”

Do I need to go to the files in the ‘my_menubar’ folder and replace all instances of ‘superfish’ with ‘my_menubar’?
Any help solving this would be greatly appreciated.

Thanks!

http://ww.wp.xz.cn/plugins/menubar/