Currently I am working on Wordpress and I want to know can I add 1 more page in admin panel appearance menu so that it looks like this: ?
Appearance Themes Widgets Menus Editor
I want to add one more page after Editor like "Theme option".
You'd use the add_theme_page() function. Basically, it's the same as adding any other settings page, but instead of add_options_page(), you use add_theme_page().