From the manual (just happened to have it on my laptop):

Displaying a list of the streets or towns/
cities on the route

When destination guidance is started, a list of
the streets and towns/cities on the route is displayed.
The driving distances and traffic bulletins
are displayed for each route section.
1. "Navigation"
2. "Route information"
3. Highlight a section.
The section is displayed in the preview map.

Bypassing a section of the route

During destination guidance, you can revise the
navigation system's route recommendations to
avoid particular stretches of road. Enter the
number of miles/kilometers that you want to
travel before returning to the original route.
1. "Navigation"
2. "Route information"
3. "New route for:"
4. Turn the controller: enter the desired mileage.
5. Press the controller.

Resuming the original route

If the route section should no longer be
bypassed:
1. "Navigation"
2. "Route information"
3. "Remove blocking"

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1995 BMW M3 (Track prepared)
2006 BMW 530xi (Wife)
2011 BMW X5 35d (Tow/Daily)