Edit your documents as much as needed to get the highest rank and beat the other participants while having high quality documents that provide information pertaining to their queries. Note that in the first iteration you will have to write documents from scratch.
Wait for the EPOCH to get started. During this time unit the results are ranked by some search engine based on the documents that have been posted. As a result, you won't be able to edit your documents during the EPOCH, but only between EPOCHs. Please review the countdown in the top of the page to get ready before the EPOCH is done.
Review your results and go back to step #1 with a plan of how to improve your documents.