You should have solved this without too much trouble.  White wins with a combination involving an advanced take and defend!

 

 

This is a key move. White captures the pawn with his rook and defends it thrice. The next step is to capture the knight with an advanced take and defend.

 

 

And black is lost.  Here’s how it plays out, if black doesn’t resign right now.

 

 

 

 

An easy victory.