It seem to be working for me. Even Celine Dion.
Sometime there are more than one version of the song. You have to pick one and click on it. You have to see the song with the cords, to get the [add song] button to work.
Also disable any and all ad blockers you may be using. White list chordie.com.
Please don't use ad blockers on Chordie.com.

It's how we can give back for using such a great service!