Hello,

1. You can find the search form and customize it in the file basel/inc/template-tags.php. PHP function is called basel_header_block_search_extended().

2. This input belongs to the WooCommmerce plugin and you need to customize pugin’s files to do this.

3. The <i> tag is used by Font Awesome library and it is not used to make italic font style. It is not actually a problem and it is not possible to customize the Font Awesome library completely.

Kind Regards