I need help with Roll Raglan sweater:

[susies1955]

I'm getting ready to decrease for the arm holes on the Roll Raglan Sweater I'm doing.
It says....
"End having just purled a row. Bind off 1 st at beginning of next 2 rows for underarm. Begin decreasing for raglan armholes as follows:
Row 1: Knit across row until 4 sts remain, K2 tog TBL (Through Back Loop), K2.
Row 2: Purl across row until 4 sts remain, P2 tog, P2."

I have ended a purl row as it said to do. Now am I reading this right? I Bind off 1 st. Do I have a bind off right????? I knit one and then knit another and pass the first stitch I knitted over the second and then I continue with what is in red? I then Bind off 1 st on the second row the same way or is there a different bind off because I'm doing purl now?
I was going to wait until Tuesday for my class BUT I've waiting now three days and I have to get back to knitting.
I should have two projects going.
Thanks so much,
Susie