Hi, I see your requirement you want to add a search field on the members page which is already built with custom post types and you want to show only member results on this page.
I saw your website I can do this task if you provide me the opportunity to work on it.
Area of Expertise :
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Backend:-
php Laravel , Wordpress,Joomla,MY SQL : 1.5+ , MongoDB ,NodeJS
Front End:-
ExpressJS ,AngularJS ,Jquery, AJAX , Javascript ,CSS
Please do let me know If you have any query
Waiting for your response!
Warm Regards!
Jatin