If you wish to change your location, you'll first need to login to your profile.
1. Click on the menu icon on the top right of the page (to the right of your picture), click Settings, then Account Settings, then 'change' to the right of 'Location'.
2. Type in the location you wish to use. When you start typing a list of locations will appear below the text box. Select your location. Even if your city or town is not displayed you should be able to add it to your. profile. You will need to enter your password before the change can take effect. Click update location when you're done. An email will be sent to your new email address confirming this change.