MakeContest script allows to use the script on one or more domains depending on the version you purchased.
If you purchased the script directly on MakeContest.com
You will receive an email with the link where you can download your purchase. In that same email you will have the license number.
You must go to the activate license page, input the license, click ACTIVATE and then click the ADD NEW DOMAIN button so that you can input the domain name in chich you will be using the script.
If you purchased the script using JVzooYou can login into your JVzoo customer dashboard and you will see the License Key.
After installing the script on your server and just before login for the first time into the admin/backend area of your site (to start setting up your contest site) you will see a screen with an input field so that you can input your License Key and click on SAVE.