You can change the flag on your account and will be shown on your account, you can change it by following the steps below:
1. From the main menu, click on “Settings”.
2. From “General Settings” you will find “Country” button, once clicked, a list of countries wil appear. 
3. Click on “Change” and choose the country you want then click on “Choose”.
-The flag on your account will automatically change on your account.