Adobe Tutorial

How to create a typing path!

Step 1: Open up Illustrator
Step 2: Click on shape tool and choose eclipse
Step 3: Draw the circle however you want
Step 4: Make sure there is no fill, but you can have a stroke if you would like
Step 5: Clink on the type tool and choose the type on path
Step 6: Place on circle where you would like text to be
Step 7: Start typing
Step 8: If text isn't big enough, change the font size

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Source: Watch this tutorial video if you need help.
 http://www.youtube.com/watch?v=8QsJYlOks0w&feature=related