First ltr of a round or row:
1) ch3 & Pull up loops in 2nd & 3rd chains from the hook & in the 1st stitch (4 loops on hook).
2) Yarn over, pull through 1st 2 loops, yarn over, pull through next 2 loops, yarn over, pull through last 2 loops (ltr stitch made).
Subsequent ltr stitches:
3) Pull up loops in the 1st and 2nd horizontal bars from the ltr stitch you just made, pull up a loop in the next stitch. Complete ltr using step 2 above.