To insert a fixture in a scene:
First you must import some fixtures in the scene.
Click the Fixture Insert button.
Click in a 2D view.
A menu saying should appear
Click on the manufacturer (remember this is not the whole fixture library, but only the fixture imported in the scene)
This should bring up a list of fixtures, select the desired fixture.
The fixture is now place on the scene.
Tips: When inserting an object from the top view, the insert point of the object will be place on the 0 of the Y axis
So if you want to import a fixture or object for a pipe placed at 12 meters from the ground, insert it in the side view by clicking at the pipe level.
No the object or fixture will be inserted close to its final height and in the center (0) of the X axis.