If you're looking for a search box in SERP, there are a few things you can do. First, make sure your website is optimised for search engine ranking. This means using keywords effectively, creating RELEVANT and targeted titles and descriptions, and ensuring your website's code is clean and error-free. Once your website is optimised, submit it to all the major search engines (Google, Yahoo!, Bing, etc.) so they can index your site correctly. Search box takes time if the webstie has good click through rate and visits search engines automatically add search box into your website. If you're still not seeing a search box in SERP after taking these steps, contact the search engines directly to inquire about why your site isn't appearing as intended.