A multitrack document is split into three sections, the mixer, the effects and the timeline...
Mixer - In the mixer you can set the track volume and pan, solo and mute tracks, and add master, send and track effects.
Effects - In the effects section you can adjust the effects settings (effects are added in the mixer).
Timeline - In the timeline you can record or add regions and rearrange them. Note: if the song is playing, clicking on the timeline will stop it from auto-scrolling.