Trying to get past my first sock

[gingerbread]

I have been trying for awhile now to get past the first sock!!!!!
I get to the Heel Flap and the patterns says to put 20 stitches on one needle
Which is fine I got that part. The part is this:

Row 1: Sl 1, Purl across

Row 2:Sl 1, K1 across

Repeat these two rows for a total of 20 rows.
Turn Heel- 12 sts. remaining

my problem with this is I slip the stitch and did what the rows said. But I have still twenty stitches on my needle and the pattern says I should have 12 remaing.
At this point I am very tired of frogging but I know I am going to have to so that I can finally finnish a sock. Oh please someone help on this.