Quick Search is available via a toolbar item. If this item is not in your toolbar, you can add it by customizing the toolbar via the "Customize Toolbar&" item in the View menu. When present, typing in the Quick Search field will run a search on the current file and select the first result after the caret. You can then advance between matches by pressing return. Press Shift-Return to go backwards. You can easily switch between Quick Search and the editor by hitting Command-Option-F.
The Quick Search Field