So I did finally Finish my first sock! Embarrassing but I just finished the leg/ribbing on 2nd sock and once again feel confused 
! If you look at the diagram showing knitting needles #1,#2, and #3. Instep is needle number #2 then there is needles 1 and 3 marked as back of heel.
I’m am now on heel flap which instructs me to start heel flap on needle #1, which only has 10 stitches. Looking at YouTube videos they are starting heel flap on needle with most stitches which according to Ann Norling that is the instep! I think this is what messed me up last time! I’m really feeling incompetent 