Congratulations for your progress. The badge in the game's avatar is added automatically. and for more informations Please check this page about the badge here
The badge/banner should automatically appear in-game, but sometimes it may take longer to change. Try passing a few more levels and then replaying level 5000, this might help to make it change.
Hello kausyKF, the Milestone banner no longer updates. You will keep any Milestone banner that you currently have, but it will no longer update after each Milestone that you complete.
