You should be able to update your address in your Profile Settings page, under 'Contact Information' - where only the country info should be greyed out:
Once the information is updated ensure you click on the 'Save' button located below:
In case you get an error message or you need to change the country of residence, please contact us and provide the new address details along with a proof of address document addressed to you and dated within the last three months (utility bill, bank statement or letter from a local / national authority).