Once the plugin has been configured in the Affiliate Linkalizer for Amazon Settings, a new Amazon ASIN / ISBN box appears below every post, where you can enter the ASINs or ISBNs for a particular book. Since ASINs and ISBNs may differ by region, it is necessary to enter one per locale. You can click on Verify Link to double-check the URL for a particular region. Be sure to save the post before doing so:

Screen capture of the Amazon ASIN / ISBN box that is shown below a post
Enter the Amazon ASINs or ISBNs of a book

ASIN

ASIN stands for Amazon Standard Identification Number, and it is what Amazon uses to identify its products. The ASIN is typically found in the Product Details section of the Amazon site:

Screen capture of the Product Details section of Amazon highlighting the ASIN
Copy the ASIN from the Product Details section of Amazon

ISBN

If there is no ASIN, you can use ISBN-10 instead:

Screen capture of the Product Details section of Amazon highlighting the ISBN-10
If there is no ASIN, copy the ISBN-10 from the Product Details section of Amazon

Published Post

Once your post is published, an Amazon link is automatically configured and added to the review box. The plugin is able to detect which country or locale a user is visiting from, and customizes the link to send them to the appropriate Amazon store, passing along the proper Associates ID and ASIN or ISBN for that locale:

Screen capture of a sample post showing the review box that the plugin generates
Sample post showing the Amazon buy button in the review box