Here are step-by-step directions on how to get the Soundcloud player on your about.me page. 

First, find the song, set, or profile you'd like to have on your about.me page. When you have the item you want, click the "share" button. 

When the share menu pops up, click and then copy the entire link.

Next, head to your about.me page. After Logging in, click "Edit" to bring up the Edit Page window. Click on "Links" to find the featured content area. Here you can paste the Soundcloud link into the top input field (the light gray Soundcloud link is just a placeholder, it will disappear when you paste your link)

Click the "Add" button and you may see a loading icon for a moment or two while the link is verified. If you've followed the steps above, your link should be confirmed and the Soundcloud player will appear on your page!