1. When your stream is live, click on a Chat icon on the left sidebar.
2. If you already have a comment you want to display, make sure to enable Auto Mode and then click Show icon on the comment.
3. The comment you selected will be displayed in the stream.
4. In Settings, you can select a theme, color, font, position and enable or disable animation. If you enable Autohide, you can enter the duration of chosen comments to be displayed, so you don't have to hide them manually.