Rowan Cobbler free pattern

I am just starting this pattern, and I am stumped already. On the second row it says to K3, lift 3rd st on right needle over first and 2nd sts and off right needle. I don’t know how to do it.

It’s like when you BO/cast off stitches and lift the first stitch over the next one. Only you have 3 sts on the needle and lift the first one over the next 2 sts.