You can choose a winner using your own criteria, or you can use Hive to choose a random winner for you. To pick a random winner:

View the entrants by clicking on the Contest, right from your dashboard, or by clicking Capture Apps > Contests > View Entry Report (the graph icon). 

Once you're there, you can see data on all your contest entrants. If you click All Entrants you'll see the Pick Random Winner button.

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