Strapi Newsletter plugin has unclear documentation

Been trying to implement it but in the documentation, it says:

  1. Go to your provider’s website, create an account and get your API key and most probably also your list ID.
  2. After you have installed your plugin, go to strapi settings and choose the Strapi Newsletter settings.

I am using Mailchimp and have the api key and put it in the .env file. But what after that? How will the plugin get the api key without any configuration? On top of that, the plugin is shown as installed on the admin dashboard but the Strapi Newsletter Button in the Plugins sections is not showing.

same problem here. Looks like the plugin is deprecated or something