So I'm new on here and it seems like the first thing I ought to do is change from using my master key to log in to using a new posting key. However, I don't have the pencil button I'm supposed to have:

Hello, all, I just signed up on steemit.com; I'm looking to use the site as a marginally more decentralized Reddit-alike. As part of that, presumably I'm supposed to be able to downvote things, right?