Hmm, well the pattern doesn't actually say anything about joining.
It says to knit 22 rounds - which I understood to be that I had to do a join.
The pattern is Fleece Artist pattern for mittens.
I only had to cast on 26 stitches - 13 divided across two needles. I've read the pattern and it doesn't say anything about needle #3.
Unfortunately the pattern is at home - I can take another look at it tonight and post more details if that will help.
Thanks for helping me with this.