I wanted to make a cat tunnel and couldn't figure out how to start it.
I found the following pattern but all it says is to "attach yarn to ring".
Attach how? I did the wrap around but was hoping I was missing something obvious?
It's a crochet pattern, so you crochet the chain around the ring, then crochet around until the tunnel is complete. You could crochet a chain and then knit in the round; it wouldn't make much difference.
Here's a link to show you how to do the cast on if you've never done crochet before.
Once you attach the yarn to the ring, you can pick up the sts with a circular needle and knit in the round if you'd rather do that than crochet in the round. I do both, so it wouldn't bother me either way...but some prefer one or the other.