The article explains how to find the URL to your Affiliate Details pages for your products. This is the page where affiliates request to promote your products.
On your seller dashboard where all of your products are listed, you will see 3 dots next to the Edit button of your product. Click the 3 dots and then choose Affiliate Details page as shown here:
The url for your affiliate details page is the link you will send potential affiliates to so they can request to promote your products.