Remix and in the username sprite change them to your username and them open up a new tab. In the new tab download your pfp. Then Go to the other tab and go to the logo sprite. In the logo sprite click upload and upload the pfp you downloaded. Then go to the on were you select part of the sprite and click copy. Then you can crop your pfp to fit inside the white square. Do that with both of the original costumes that I put there. Then click share and add leave a comment asking if I can put yours in the studio! Have a nice day!
Studio link: https://scratch.mit.edu/studios/29326879/