Right-click in the URL bar.
Click on 'Edit search engines...' when the context menu appears.
Click the 'ADD' button in the bottom right hand corner.
Enter the following details
Search engine:WackySafe
Keyword: *
URL with %s in place of query:https://wackysafe.com?=%s
Scroll through the list of search engines until you find our listing for WackySafe, then click 'Make default'.