If you have created a new composition or derivative work and just intend to upload it for non-monetized, non-profit promotion then yes, you need to include a link to https://freevocals.com in the track description.
You must not feature our artists name in a non-profit, non-monetized track title or description. We will only consider feature requests on certain commercial releases.
If you don’t feature a vocalists name in your track title and do include a link to our website in the description, then you don’t need permission to upload a non-monetized, non-profit track.