I’m not familiar with that theme unfortunately (there are over 500 000 different themes on the market). I suspect there is probably a way to place the plugin search bar there.
First, try the automated replacement feature. If the theme requests the search form properly, then it should be replaced automatically with that.
If that has no effect, try looking on the theme settings or the theme editor, usually there is an option to edit the search module and place a custom shortcode module there.