How do you vote or know if you've voted?
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Select the bottom right circle and a checkbox will appear, you have to select two entries, then a "Let's Vote" button will appear on the brown toolbar or whatever it's called at the bottom of the page. You might have to scroll up and down a bit for it to appear, it's not the cleanest way of displaying info to the user.
After that you have to enter your e-mail address and click on the confirmation link in the e-mail you receive.