List Blog Post by group in index

I'm here again for a similar problem of this my topic. Now I can not be the only show in the box group_blog_post Index. Where can I find the list of types and subtypes? I tried to write [type => group subtype => blog] and [type => blog subtype=> group] but of course is wrong. How do I find the entity type of an object?

Notify:The user in my community will have only one group for user. a user can't join in a second group. ^^

 

thanks for the help

 

P.S.

 

I also thank @ Team Webgalli for the suggestion that surely will use

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