how to code a search icon

https://www.onthelist.co.za/wordpress/

Hi, I have a search icon on this website which doesn’t work as its been customised – https://www.onthelist.co.za/wordpress/

I know no idea how to code it to work on what to do to make it work.

Any ideas out there please? i’m desperate.

This is another website that uses the same theme (and search-form) and it works on this website – wwww.cfesmokehouse.co.za

Thanks