Embedded Search Box Code : "<div class="mmy_drop_down" ></div>"
Copy the above code and follow the below steps :

-Go to Online Store => Themes => Actions => Edit Code
-Under Sections Menu, look for the File and open the Liquid File where you want to add the Search Box.
-Place the above code and hit the Save button.
Now, open the page and see the Advance Auto Parts Search Box on-page.