Menu on mobile phones + Get rid of powered by wordpress

When I see my page on my mobilephone I see sub-menus and sub-sub-menus as well. How can I change it, so I see see one the Top-Menu?

How do I get rid of the “powered by Wordpress” at the footer, without using an FTP client. Is it possible to do that in the Editor on the Wordpress site?

Thanks a lot

Mobile menu is powered by Tiny Nav which is something I haven’t created myself, so I have no control over it.

Footer information can only be edited via FTP and there is no other way around it. Information is located in theme folder - library - structure footer-extensions.php.