Need help with Photoshop and Imaging......Example Photo

What is the command to adjust the size and shape of the circle? If you see the bottom of the image you see I have a little more there than I should. I just could not control the transformation perfectly. Somebody told me in an older post but I can't find it.
Other than that I'm REAL HAPPY with this image of a 2006 AGE 20th Anniversary Uncirculated coin.
Other than that I'm REAL HAPPY with this image of a 2006 AGE 20th Anniversary Uncirculated coin.

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Edit: nevermind- I just read your question correctly.