To add your country flag to your profile
1. Go to Profile at the top of the page. (between usergroup and messages)
2. Scroll to the bottom of the profile page.
3. Choose your flag, by clicking the appropriate dot.
4. Move to bottom of that page and click Save.
Your flag should now show in your posts and your profile page - to check this go to one of your recent posts or write a new one and when your post shows you should see your flag.
If it does not show repeat the process again.