Add Location to 'pick a place' list

[m4rko71]

I have a lumia 800, no facebook account, but a twitter one - the check in works as long as the place i'm checking in to is listed in the 'pick a place' list. if not I am unable a click 'add location' as it is now 'greyed out'!!!

Does anyone have any ideas, as I am struggling to find any help on the matter from either Microsoft or Nokia.

(Location services are switched on)

Thanks in advance.