Hey, Flagpoling is when you exit Canada and come back to land as a PR, or to trigger a Work permit. To do this you need to 'exit' Canada by going to a land border - You can either do a one day trip to the U.S or just tell the U.S officer that you're doing flagpoling to apply for a Work permit in Canada, they will issue an Administrative refusal and send you back to Canada. Once in the Canadian side you tell the Canadian officer you are doing flag poling to apply for a PGWP. He'll request your documents and ask you a few questions, if everything looks good he'll issue your Work permit on the spot.
You'll have to pay the PGWP fees again ($255) and withdraw your online application via webform once you've your PGWP.
Good luck!