For google chrome, when on search.pch.com, you can right click the search box and select "Add as search engine".
When this is complete, you can go into the google chrome settings by doing the following:
Click the wrench icon on the browser toolbar.
Select Options (Preferences on Mac and Linux; Settings on a Chromebook).
Click the Basics tab and find the "Search" section.
Select the search engine you want to use from the menu. If the search engine you want to use doesn't appear in the menu, click Manage search engines.
In the Search Engines dialog that appears, select the search engine that you'd like to use from the list.
Click the Make Default button that appears in the row.