Fillet Edge will not let me select any edges even though they are Joined

I’m following the Rhino 5 for jewellery book by Dana Buscaglia (pg 355), however I am using version 6. It wants me to select the entire pendant to fillet but every time I follow the instructions nothing happens. When I try to select a single edge instead, it will not allow me to make a selection. Other forums say it must be a joined edge, in this case it is. So not sure what to try from here. Thanks for your help.

can you upload the file?