Search form and Add Listing button redirect to Not Found page

If I press on any of these two buttons Screenshot by Lightshot , it goes to this page Screenshot by Lightshot , how can I change the link? or what should I do ? Thanks!
Also, how can I move the ‘‘send a message’’ on the listing page, above the ‘‘request to book’’ button? Like this: Screenshot by Lightshot

Hi,

Please refresh the permalink structure in Settings/Permalinks (choose any structure with %postname% if the default one is selected) and check if this issue persists.

It is possible to move the button, but it requires additional customization, for example, a CSS snippet.