We usually provide the early links for the Yeezy release, before the release we will notify you by email that the instructions for the Yeezy are now available on the Bot.
To find the release instructions, open the Bot on the top right there is a Red button, click it and the instructions will appear for you.
PID is the style number for and Adidas item (Adidas US site) you enter it into the early link field. To get it, please select "help" --> "get keywords and early links"
You can find your own early links for normal releases. How to do that? Please read this article to see how: How to Get Early links