Hmm... I was having trouble posting.... then Ingrid beat me to the punch!
To knit in front, just put the needle in regular, like usual after you knit in the back loop. You're making 3 stitches in one. When you turn and purl, you're going back to the beginning of the bobble, so you can decrease those 3 stitches and keep knitting.
Another way to do it is this way:
Knit in front, back and front of the stitch
Slip those three new stitches back to the LH needle, and knit all 3
Slip those 3 stitches back to the LH needle again.
Slip 1 stitch to the R needle,
knit the next 2 sts together, and pass the slipped stitch over (like binding off)
resume knitting normally.