I don't understand what you mean, but I suppose you should use the plugin now.
Place the search shortcode somewhere, or use the search widget.
But because the plugin has like 300 options and hundreds of features I suggest to go through the documentation, for better understanding: http://wp-dreams.com/demo/wp-ajax-search-pro3/docs/
For frequent issues and questions you can check the knowledgebase: https://wp-dreams.com/knowledgebase/
Feel free to experiment with the options, there is a lot of them, as you can see on the backend.Best,
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