At a Senate election you can only vote for a candidate who is contesting the election in your state or territory. Twelve senators are elected to represent each state and two senators are elected to represent each territory.
On your white Senate ballot paper, you will have the option of voting above-the-line for the parties or groups of your choice, or below-the-line for your chosen individual candidates. However, you will only be able to vote for parties, groups or candidates that are listed on your state or territory ballot paper.
This fact sheet has more information about voting in federal elections.