Hi Brownbear101!
Welcome to ccMixter!

Here’s how to get the play button:
1) go to “Manage Files” …
2) select “Add Replace Delete Files” …
3) select “Add a New File” … then upload an MP3 in the same way you uploaded the first file.
4) After that, go back to “Manage Files” and drag the MP3 to the top.

Thank you for sharing your music with us!