When you install the Sortd Chrome Extension you will go through a sign-up process that will ask you what you want to use Sortd for.  If you select either Sales or Sales Management - since the Sales Power Pack is an optional paid feature and requires one of the premium plans, you will automatically be starting two 30 day free trials in the process.

The first trial is the Team plan, which gives you the ability to collaborate with colleagues on shared boards.  The second is the Sales power pack, which gives you the ability to manage your sales pipeline.

When your 30 day trial expires you will see a green notification at the bottom of the screen with an option to purchase.