How can I register my username?

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http://unix.stackexchange.com – I know this belongs in meta, but I cannot anonymously post a question there. I have clicked "register" and logged in with my Google account, Facebook account, and I have even created a stackexchange account and my user profile still shows "unregistered." I cannot upvote, etc. I have tried clearing cookies, using a different browser, and each time I am able to log in using any of the above to an unregistered user. Any troubleshooting tips? I would like to participate. (HowTos)