MATE IN TWO

you better set up a diagram as a puzzle. then we can move the pieces It is the third option in the insert diagram screen

It should be 1.Nc5 but still it doesn't work because after 1. Nc5 black knight moves and B+ so white can't continue with strategy and if 1. Ne5 then 1...Nxe5 and it doesn't work either...
So I don't know here...