User blog comment:Chrismh/AiStars Idol + & - Competition! ~Round 2~/@comment-27176967-20170619141234/@comment-3237624-20170620095455

Well editing it gets the person running it confused XD so you should definitely reply to your comment rather than try to change it.

And of course you can, it's the same as usual. You need to wait 24 hours, but since you re-voted you can rely on your original voting time.