You can post your entry to the competition forum thread. A quick and easy way to do this is using the Enter Competition button. This lets you select one of your poems to enter.

At the top of every page in a competition thread it states the submission deadline or a notice that the competition has already ended and is awaiting judging. You should only enter a competition if it's still open.

Please be sure to read the first post of any competition thread to make sure your entry meets the rules and requirements.