On the top right hand side of your profile, you will see your picture. Click on your picture and a drop down list will appear. Select 'more profiles'.
Next click on settings next to your profile photo.
You will see a tab for address. Click on edit to change your address.
Once you have entered your address send a photo of mail such as a utility bill or bank statement etc. that shows proof of name and address to firstname.lastname@example.org to verify your address.