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steemit says I don’t have enough STEEM POWER or voting power to remove my downvote. I need to have enough SP or voting power to remove it. I'm not sure about the rationale of this. But this means that little fish like me should not downvote hastily because if you change your mind you won't be able to revert your down vote.

Any one should check their voting power before makeing downvote or upvote. Any one could check their voting power by going to steemit.com/@yourname, which should be more than 75 for doing that. Otherwise we should make comments first and get more voting power.

Thanks @lihua. But you probably mean steemd.com/@yourname instead of steemit.com/@yourname. The latter simply takes you to the user profile not the steemit account itself. With steemd.com/@yourname however, will show more detailed information about someone steemit account. But thanks all the same for pointing that out.