Edit search function in Zerius child theme

Hi,

I am using my wordpress as a welcome page for a marketplace which runs on a different site (I am using sharetribe). If someone makes a search in search box on my wordpress, I would like that the user is directed to the page where his search is inserted in the search formular on my sharetribe site.

I know this can be done by making the search action button directing to https://delecamp.sharetribe.com/?q=some+keywords
(This page, with the “q=” parameter followed by the typed keywords, would be the direct link to the search results.)

I suppose I would need to edit the child theme of Zerius. But do anyone know if there is an easy way to achieve what I am going for.

Furthemore, do you know

1) if I can make the search field on appear all the time on the site, and not just when the search icon is pushed.

2) If I can edit the text in the field, that now says search

3) edit the name of the search button.