The search bar is located at the top bar in your Bokun interface.
The search bar can be used as a shortcut to all the options in your Bokun interface. You can search the main menu, i.e. Bookings, Products, Reports and Contracts - and all it's options. You can also use it to search all the options found under the cog wheel. You can not search for clients or bookings.
You can navigate straight to the search bar by holding down "ALT" and clicking "G". The keyboard arrows can be used to move up and down and "Enter" to select.