Well, I've never done the "Bee in a Jar" quest (or whatever it is) but you can rotate objects in your inventory by selecting the object from the list on the left and then clicking on the image of the object that shows up on the right. By holding down the left button and dragging the mouse you can rotate it around.
But I'm guessing you mean rotating objects outside of the inventory menu in the game world. You can rotate objects by picking them up in first person (hold 'E') and then moving the camera around. It's not an exact science, but if you move to the left, objects tend to rotate one way, if you move the right, they rotate the other way, etc. If the task is to get a bee into a jar by rotating it in the game world, I imagine it's a little tricky.