I just joined Area 51 and noticed a strange bug on the meta: Although I have 50 reputation, it still says that I can't comment on the meta because I don't have 5 reputation. I also therefore can't ask questions because you need 15 Area 51 Discussions reputation to ask a question. Why might this be happening? Pictures:
Looks like you only have 1 reputation on Area 51. Reputation is earned on a per-site basis and does not carry over, so you need to earn enough reputation on Area 51 itself.
It's worth noting that you have 199 reputation on Arqade. Once you hit 200 reputation on any site you get a +100 association bonus on every site, so all you need to do is earn +1 on Arqade and you will get the bonus on your Area51 account.
Also, on Area 51 (as opposed to other sites) you can verify your email address for an additional +50 reputation (as mentioned in the FAQ).
You can read more about how reputation works here: