Some of the topics have little locks beside of them and I can't post on them. Why?
You just answered part of your question. When a topic is locked you can't post in it.Some reasons why:Ans - Answered.Adv - Advertising.Dup - Duplicate.Necro - It's old and someone decided to bring it back or it's a few months old and someone brought it back without a good post.Req - Requested lock by the opening-poster.Spam - Self-Explanatory.Read the Stickies - Read the threads that are at the top of the page - they have a red push-pin and are bolded.
And now this one can be locked and labeled.
Thread is locked!