Right side facing? Knit up? Join yarn to inside edge?

[geoelijam]

Hi there,

I am knitting a pair of Shaped Leggings and have become stuck. I am doing one leg at a time and have made it to the section where I need to knit the foot of the leggings. The steps are as follow:

1st row - Knit to the last 3 sts, turn.
2nd row - P12, turn.
Work 22 rows on these 12 sts for instep.
Break off yarn. (I have completed up to here and can't go any further)

With right side facing, join yarn to inside edge of 21 sts on right hand needle, knit up 15 sts evenly along side of instep, knit across 12 sts for instep, knit up 15 sts evenly along other side of instep, the K3 ... 66.

If anyone can help me it would be greatly appreciated! At the moment I have three sts on my left (the last 3 from the 1st row) and 33 on my right.