I'm a new Hitfilm user, and I'm so confused on how I input another audio track, does anyone know how?
Welcome to HitFilm
Drag and drop beneath the existing audio track.
On the righ hand side theres a scroll function, depending on how large youve made the timeline (highly dependent on your display's set resolution), you may not be bble to see it, but it's there.
Right click on the audio tracks, and you will get the controls to insert a new track.