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I just joined this site and being an active member on stack overflow gave me 100 reputation points.
I went to answer this question and found the banner:
There is no button to post an answer.
I think this might be a bug.
It's not a bug: it requires 10 reputation gained on this site. Your reputation gained on this site is 0, you have 1 starting rep, and 100 association bonus which doesn't count for this.