The link is http://mwave.interest.me/star/poll/result.m?poll_seq=223
You can vote once everyday.
1. click on 'Poll List'
2. go to page 3 on the list
3. Look for '[Active] [Poll] Vote for Mwave’s Star of the Week for the 1st Week of January'
(it is at the end of the page)
4. click 'VOTE'
5. click on the little circle next to RAIN [currently #1 with 60% (2,683) votes]
6. click 'VOTE'
7. it will ask you to login if you haven't login yet. Click 'Yes' and it will take you to login page.
8. you can login via Facebook or Twitter [the fastest way]