The join occurs when you knit the first stitch on the first needle with the yarn coming off the last stitch of the last needle.
One way to get a tighter join is to cast on one extra stitch, slip that last stitch from the last needle to the first needle and knit them together to make what will be your first stitch of the round.
"Trust the pattern!"
Time flies like an arrow, but fruit flies like a banana.
Hop aboard while we follow the cloud-covered van of knitting harmony, man!! Woooo!! --Hedgehog
IngridKH on Ravelry