I have a new house and in case you don't know most new homes now have rounded corners. And I'm installing a chair rail in one room that has them. The chair rail I bought doesn't have the pre-made rounded corners that can be bought at Home Depot or Lowe's. So my question is how do I have a chair rail follow a round corner that doesn't have corner pieces? Thanks for any help.

Actually, most new homes do not have rounded corner beads. That is an option that can be chosen if you like the look. I have not seen any rounded corners made of chair rail material. You may have to fashion one by hand and that will not be easy.

Actually, they sell chair rails now made of flexible PVC material that you can use around the corners. You can also buy the majority of the rails in wood in the same style and piece them together. Lowe's sells this.