Hi, sorry for not getting back to you sooner. I’ll have to make it a point to check the forums for any issues users are having.
WordPress Amazon Associate unfortunately is a long name and doesn’t display nicely in WordPress’ Admin menu. Therefore all the plugin settings and configurations are found under the menu item WP – Amazon.
You will find that in the main Settings page that you can set your associate/affiliate ID for all Amazon Locales.
Please let me know if you have any other questions and I will be sure to update the plugin page with detailed installation/setup instructions once I wrap up development of version 1.3.0
P.S. Additional information on usage can be found on my project website
I myself didn’t understand this until I read the documentation in detail.
By signing up for an Amazon Web Services account (with the same credentials as the Affiliate account) and entering that data in the WP-Amazon settings, the affiliate account is automatically attached.