Answer:
To find your ID you can go to the homepage and in the top-left corner of your screen will display your virtual character!
If you click on your charactar when in-game it will show a brief summary of his achievements, such as his name, motto, look, badges, group and tags.
When on the homepage, click on the tab that says "my page" to look at your profile homepage. This page displays your badges, character info, rooms, music, rating, friends list, guestbook, etc.