Can't Post Links Or Send Private Messages? Read Why Here!
AFAIK, you don't need to have a certain amount of posts to be able to report rule-breaking content unless you want to include a link in your report, which seems to be your case. You need to have at least 15 posts to be able to do so and don't think there's anything can be done about it to be honest. Anyhow, I'm sure @Liz can clarify you further.