First click "Edit Profile" in the upper right of your profile. Once in edit mode click "Upload Profile Image" over your avatar. After choosing a charming representation of yourself your image will be scaled and centered. If you'd like a little more control over your image, crop it into a square in your favorite photo editing software. Your photo will automatically save. Click the Exit Edit Mode button and you're good.

Below is a video showing you how to do it.

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