Tomorrow, Thursday, June 12 is Ontario's provincial election. To be eligible to vote, you must be over 18 years old, a Canadian citizen and live in an electoral district. You can only vote once and you need to bring identification with you. Voting stations are open from 9 am to 9 pm. If you do not know where to vote, you can use the Elections Ontario online tool.
You can find more information on voting in the Guide to Voting in Ontario's Provincial Election. You may also find the article Where can I get information on Canadian political parties? to be helpful.