A labels duties generally include publishing your music and running marketing campaigns to help get it heard. Additionally, Labels may provide artists with budgets and/or tools to help develop material.
When you upload your music, you have the option to either create a new label or select one which already exists on your account. The label is often shown on the tracks page so it’s visible to users who’re listening to your track.
If you don’t have a label you can just distribute directly under Spare Music. Labels are free to register and won’t delay your distribution time.