How do I use add-on Simple Curves to chamfer point? I would like to be able to make a round corner on a curve similar to chamfer in 4D, like a smoothly bent tube? I've found and added the add-on Simple Curves but don't know how to do it? Or maybe I don't need the add-on?
If we are talking about this Simple Curves add-on:

First of all Install add-on from file, check it to have it enabled and Save settings.




In Edit Mode find Misc tab in Tool Shelf.
Select Curve point.
Choose Fillet.
Tweak Radius.