If you want to update an address simply enter the first letters of the name in the search field on the address book page.
This will open up all matches with the name / address fields ready to be edited.
It will look something like the pic below. Update the info you want updated, all fields can be edited
except for the name.
Once you have updated the address simply switch page ( click on the orange on upper left hand corner of screen ) and it will be saved automatically. Then go back to address book and search again and you will see it has updated the info.
