To monetise your tracks on YouTube through Label Worx, you first need to set up YouTube management on your channel. If you haven't already done this, please follows the steps in this article: How do I setup YouTube management
Once the channel management is set up, follow these steps to monetise your tracks.
1. Go to "Release Management" -> "Monetise YouTube"
2. Select the tracks you wish to monetise
3. Click "Monetise" in the icon menu
4. Confirm you want to monetise these tracks
Note - You can only monetise a track which has been set to final for distribution..