How do I make another studio when I already have 1 called Mazey?

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If you want to own more than one studio, just create another one.

If you want to make a studio with the same name as your old studio, delete the old studio (find it in the My Studios tab of the My Stuff page and click Delete, which is under the amount of projects in the studio) and make a new studio with the same name as the old studio.