Novice knitter stumped on "Casey's Coat"

[crazydoc]

Greetings, fellow Craftster addicts!

It has occured to me that I may have well gotten in over my head with the "Casey's Coat" project in SNB Nation.

I am a novice knitter. With emphasis on novice. 

The portion with which I am currently struggling (I'm sure there will be more down the line) is found on p. 224. The instructions state:

Next row: K9, join new yarn, BO 6, k to last 15 sts, join new yarn, BO 6, k9 .

From what I can gather, a person somehow ends up knitting with three balls of yarn after this herculean (for me) accomplishment (see line in green above) has been completed.

I understand that BO means "bind off". I can do that. I understand that k means knit. I can do that, too.

What is escaping my grasp altogether is the "join new yarn" bit.

I'm guessing this is probably the point at which the openings for the front legs are created.

Any light you can shed on this for me would be deeply, deeply appreciated, both by myself and [enter shameless plea for mercy] by a shivering Maltese (my mother's little dog) in the Midwest.

TIA,
~CD~

[gollygeeitsamy]

well i haven't knitted this (yet) i believe joining the yarn is to add your next color for the stripes and don't worry that's super easy!!
i'm a visual learner so knittinghelp.com should come in handy for you and the joining yarn technique is explained here: http://www.knittinghelp.com/videos/knitting-tips
i hope this correct and i hope that this helps. oh and post the sweater when you're done!