How to set up Search Box ID on Magento 1

First, you should know the ID used in your storefront:

1. Go the storefront of your Magento store

2. Click on the search field with the right mouse button, then click on ‘Inspect Element‘ in the context menu.

   
   You should see a developer console with a highlighted line, which should look similar to: 

   <input id="mysearch" type="text" name="q" value="" class="input-text"/>

   The value stated in the ‘id’ attribute the one you need (‘mysearch’ in this example).

Now, give this value to Searchanise:

1. Go to your Magento store admin panel
2. Go to System → Configuration
3. In the left pane, find SEARCHANISE → Settings and click on it
4. Enter the obtained id value in the field Search input HTML DOM ID
5. Click on Save Config