To enter the Doodle4Google competition, you'll need to create an original doodle that celebrates Google's history and what it means to you. Once you've created your doodle, you can upload it to the competition website. From there, you'll need to provide some basic information about yourself and your doodle. Once you've submitted your entry, it will be up to the Doodle4Google team to decide if it meets the criteria for the competition.