If you think you are, it's still a good idea to check ahead of time here to confirm that you are registered at your current address.
To vote in Wisconsin you need to be registered. You can register any time up to and including election day. Before an election, you can register in person at your city clerk's office, or by completing a voter registration application and mailing it to your city clerk. On election day, you can register at your polling place with ID and proof of address.
You can download a voter registration application here. Mailing addresses for city clerks in all of Wisconsin's communities is available here. More information on voter registration is available here.
The election division of the Wisconsin accountability board has an online way to find your polling place simply by entering your address. It works for most Wisconsin communities.
If this does not work for you, contact your municipal clerk. You can find the phone number in the government pages of your phone book, or look up contact information here.
If you can't or just don't want to go to your polling place on election day and are already registered you can vote absentee. To get an absentee ballot, fill out an application and send it to your city clerk. You can look up your city clerk's address on one of these lists. But you'll need to get your application to the clerk's office by the Thursday before the election.
Early Voting: You can also show up at your city clerk's office and apply for and even fill out your absentee ballot right there.
More about absentee voting here.