You can use the unvote button in the top-right corner of the poll to change your vote (: It's just put in white text, so it's quite hard to see. Press Ctrl+A and you should be able to see it better.
And big disclaimer: This round's voting deadline will be shorter, what means that the new HoHs will be PMed earlier as well, so do not forget to post and vote! New HoHs will be decided and PMed tomorrow evening with time until voting deadline. So, the schedule for next 3 rounds is:
Round 4 - VOTING: 28th March - 30th March (17:59 CEST)
Round 5:
- Heads of Household: 29th March (late afternoon / evening) - 30th March (17:59 CEST)
- VOTING: 30th March (17:59 CEST) - 31st March (23:59 CEST - to be confirmed)
Round 6:
- April Fools Day: Voting for funniest titles on 1st April until the evening
- Regular round: normal 2-day round (Double-Elimination round in Semi-Final 2)