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When you cursor over the arrow that turns blue.... when blue it allows you to remove your vote. That is what I saw when I moved my cursor over it.
Hope that helps,
Mike

Where can we learn about this posting thing?

I learned more about steem and steemit by reading the white paper: https://steem.io/SteemWhitePaper.pdf

There is also a good post at the following link:
Things we can do to increase the price of Steem

After clicking on the above link, scroll up to the top to read the post.

Mike

Congratulations @fuksanahgi! You received a personal award!

Happy Birthday! - You are on the Steem blockchain for 3 years!

You can view your badges on your Steem Board and compare to others on the Steem Ranking

Vote for @Steemitboard as a witness to get one more award and increased upvotes!