Where do i find specific html?

I’m trying to locate this html in your plugin ti modify it.

<div class="search_jobs">
  <div class="search_keywords">
    <label for="search_keywords">Keywords</label>
    <input type="text" name="search_keywords" id="search_keywords" placeholder="Keywords" value="" />
  </div>
  <div class="search_location">
    <label for="search_location">Location</label>
    <input type="text" name="search_location" id="search_location" placeholder="Location" value="" />
  </div>
</div>

The page I need help with: [log in to see the link]