Hello,

01. you are editing the wrong header. Woodmart theme provides the option to create different headers for different pages:
https://xtemos.com/docs-topic/how-to-set-different-header-for-specific-page/

You can check the custom header for a separate page and edit it.
https://xtemos.com/docs-topic/options-for-pages/

02. I have activated the parent theme on your site. Now the page is able to be edited.

Best Regards.