When your in shift U mode, putting down cones and stuff, i can select the object i want, but i cant figure out how to place it on the track.

How do i do so?

Press O to place a new object at the place you're pointing at, or press M to move an selected object to the new position.

thanks =)

Save yourself some headaches and download LYTe, it's great.

Or you could look in the docs folder in the lfs directory.