Help with a bootees pattern

I am making some baby bootees for a pregnant friend. I am using a Peter Pan pattern and have got to the folowing stage and just dont know what to do…

I am on the divide for the foot, the pattern reads…

break off yarn. with right side of work facing and continuing on from the 10 sts on right hand needle, rejoin yarn and pick up k12 sts evening along side of instep…

I cant work out what ‘break off yarn’ or ‘rejoin’ means exactly

any ideas?

Cut your yarn and to rejoin, just start knitting with it at the new place.