Once region is set how do I change it on the

By default, the Magellan RoadMate has the region setting for the lower 48 United States. When the receiver is turned on for the first time it may ask you to assign regions. Select the map region you want to use by tapping on the item from the list.
If you are travelling in other regions you will need to change the map region by using the following steps.
1 From the Main Menu, tap on the right arrow to access the second page of the Main Menu.
2 Tap on User Options.
3 Tap on Region.
4 Tap on the map region desired.
The Region option will display the map regions that are available for the Magellan RoadMate you are using.

Also if you want you can download the user manual from this website

visit website
or
download

Hope this helps
thanks