What you mean by "random"?
Just click on the clip you want to edit, then use trackpad or mouse wheel with modifier keys & their combinations to scroll around, zoom in horizontally and vertically. The first two you can also achieve dragging the ruler left/right and up/down respectively. There's also W/E keys alone or with Shift.
EDIT: 1st 5 minutes of this video show what's what
https://youtu.be/kf5MxgoZ99s