it says chain 4 then do 9 double crochets in first chain. How do i do 9 DC in one chain?
You insert your hook into the first chain and do your double crochet, then repeat in that same chain 8 more times. Trust me, they'll fit unless you're an insanely tight crocheter. It sounds like you're making something circular. You'll end up with a little disk of 10 double crochets (the 3 chains in between the first one and the one on your hook form one DC too)