How to do it
Ch 2, insert hook in 2nd ch from hook, YO, pull up a loop, YO, pull through 1 loop on hook (ch made), YO, pull through 2 loops (first FSC made), *insert hook into the ch made at the base of the stitch, YO, pull up a loop, YO, pull through 1 loop on hook (ch made), YO, pull through 2 loops (second FSC made). Rep from * until you have the desired number of stitches.
Visual Steps
Ch 2
Insert hook in second ch from hook
Yarn Over
Pull up a loop
Yarn over
Pull through 1 loop on hook (ch made)
Yarn over
Pull through 2 loops (first FSC made)
Insert hook into the ch made at the base of the stitch
Yarn over
Pull up a loop
Yarn over
Pull through 1 loop on hook (ch made)
Yarn over
Pull through 2 loops (second FSC made), repeat from step 9