When you are first getting ready to distribute your track, you will see in the track section there is a field for artist names.

Here you can list as many primary artists as there are on the track level.

You should list them out as "Artist 1" or "Artist 1, Artist 2". Always make sure to separate artist names with commas.

To add a featured artist, you will want to list out their name in the title of the song such as "Track Title (feat. artist name)"

If you have already uploaded your track but need to update the artist's name - please go to the track section of the release and click edit. There you can make the changes you need.