some help to understand newsletter flow

First, I would like to thank all those who have led the development of this great module.

After installing the module (7.x-1.0-beta9) 4 times, send a newsletter was impossible. I always get the error:

1 Newsletter Lists failed to send because no published nodes found for their terms

In a new installation, I verified that the module creates a new taxonomy (newsletter categories) but if you look at the configuration of the template fields (admin / config / media / newsletter / templates / fields) then we can see that there is a field (field_tags) that reference the terms of the taxonomy tags, not the one created by the module.

If now I try to send the newsletter, an email is launched but without information to the nodes. Actually there are 6 nodes (blog content type) with reference to a term of the category tags, but none appears in the email.

What is the function of "Manage fields" inside Templates, Subscribers?

Within the configuration form list, exists an autocomplete field called Category. What is its function? In early attempts could find the related term in the nodes, but is now missing.

I feel so confused, I have two days with this points and I'm going crazy ... ask here is my only option to advance. I hope to find someone who can help.