Unwanted edge outside of the geometry I'm sorry, I'm a blender modeling beginner but I don't know why I have an edge floating outside of my geometry that I can't get ride of. I don't know how it got here. I tried "remove doubles" but that didn't do anything. In edit mode, the edge or the vertices can be selected but not deleted.

Thank you
You have to go into Edit Mode, to be able to delete geometry. 

Then, click the selection-box with a line. (Directly below the yellow highlighted line). 

After that, you can select the line you dont want and press the "X" key, and select "Edges" in order to delete the unwanted edge.