You are qualified to register to vote in Ohio if you meet all the following requirements:
You are eligible to vote in elections held in your voting precinct 30 consecutive days after you are duly registered to vote in this state; however, you may request an absentee ballot during that period.
How Do I Declare or Change Political Party Affiliation
Under Ohio election law, you can change your political party at a Primary Election only. This is done by requesting the ballot type for the political party you wish to be affiliated with. ORC 3513.19, 3519.20
If you do not want to be affiliated with a political party in Ohio, you are considered to be an unaffiliated voter. An unaffiliated voter, which is identified by some people as an "independent voter", may only vote an Official Questions and Issues Ballot, if there are any present, for your precinct on Primary Election Day. Unaffiliated voters can vote for candidates and issues in a November General Election.