Right mouse click very wide horizontal bar at the top to place the big vertical red bar somewhere. (That's the end marker.) If you downloaded the normal Musagi package, there should be a brief manual included (html file).
If you don't live for your dreams, you don't have much to live for.
That's called the timeline, too, by the way. Sometimes patience, calm and focused progressing is all it takes. You should definitely study the documentation for a moment.
I know it's sometimes tough, because you want to know some specific thing and you can't seem to find it right away. This is when you allow yourself to be guided through it all by some scripture. In this case it's drpetter's nice documentation that comes with version 0.23 from his website.
I still need to add some more info for my version [t1.67], but I'm just not done with it, yet. That's my best excuse.