How to add another page in appearance tab of admin panel?

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().

More info:

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)