Help on pattern please

I want to knit this bag and the pattern states as follows:
Cast on 36 sts. Row 1: K13, hook a split lock marker into a cast on edge in between the needles, and place a ring marker on your right hand needle

The split marker goes where? It can’t be in mid air and the ring marker goes on the right hand needle and I assume, if they wanted the split lock marker on the left needle, they would have said so.

Can you tell me what this means?
Thanks.

Cast on 36 sts. Row 1: K13, hook a split lock marker into a cast on edge in between the needles, and place a ring marker on your right hand needle
Well, you are working the first row after the cast on. After you knit 13 of the 36 stitches you want to put a split lock marker right on the cast on edge between the last stitch you knit and the next stitch on the left hand needle. With my long tail cast on I have 2 little strands there, I think I’d put it on the strand in front, nearest me. Then before you start knitting again, also place a ring marker on the right hand needle, then you knit on as directed.