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Tap a location on the map or search for one by typing your destination's name or address in the search bar at the top. It's the blue button on the bottom-right of the screen. It's the icon with three horizontal dots on the top-right of the screen. It's near the bottom of the pop-up menu next to the icon that resembles slider bars. The knob will move to the right and turn blue when the switch is on. These options will avoid highways, toll roads, and ferries.
Select a destination on the map. Tap Directions. Tap . Tap Route options. Tap to switches for each item you want to avoid to the 'ON' position.