TomTom VIA Reference Manual page 26

Tap this button to change the current destination.
When you change the destination, you are shown the same options and
asked to enter the new address in the same way as when you plan a new
route.
Change destination
Tap this button to avoid part of the current route.
You are shown a list of the street names on your route. When you tap one
of the street names, your VIA calculates a detour to avoid the selected
street. The route summary shows both the new route and your original
Avoid part of route
route. Tap the panel on the right to select one of the routes and then tap
Done.
If you do not want to use either of the routes shown in the route summary,
tap Change route to find another way to change your route.
Tap this button to change your route by selecting a location you want to
travel past, maybe so you can meet someone on the way.
When you select a location to travel past, you are shown the same options
Travel via...
and asked to enter the new address in the same way as when you plan a
new route.
Your VIA calculates the route to your destination via the selected location.
The selected location is shown on the map using a marker.
You receive a warning when you reach your destination and when you
travel past a marked location.
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