Hi guys...I've just bought an 07lux with satnav...only im having a problem changing the "home address" and personal information...the relevant options and tabs seems unselectable or blanked out. I am able to change certain values, for e.g name's of entries, put in new address' etc, but alot of functionality of the unit seems intentionally blocked for reasons unknown to me.

I don't have an owners manual just yet as the previous owner "lost" it, so any help regarding this would be greatly appreciated,