Blog owner can only see own blog-entries

Hello from Germany,
I would like to allow the member of our non profit organization to own a blog and present it to the other member. I have used
Menu-type Plugin
Plugin Blogs
Function Show Blog
which results in the following link: (see attachment)
But each user can only see his own blog.
How to configure, that user can see all blogs?
Thanks in advance for any help.

There isn't a frontend view for browsing blogs. They're browsed exclusively from profile. This only applies if you're using the Internal model though. If set to Joomla it'll store the blogs to Joomla content component so you can use Joomla content component views to browser blogs.

" If set to Joomla it'll store the blogs to Joomla content component so you can use Joomla content component views to browser blogs. "
Is there any explanation available, how to do it? (I am new with joomla)
Thanks in advance.

Edit CB Blogs in CB > Plugin Management. You can adjust the model used for blog storage under the Parameters tab. Note existing internal blog entries will not migrate over when changing this setting. You should have a blog category structure setup in Joomla content component as well to hold your blogs then select that blog category as the top level category in CB Blogs parameters. Example structure as follows.

Blogs
- Movies
- Games
- Sports

With the above you'd set "Category" to "Blogs" in CB Blogs.

Thanks a lot.

I have Categories see pic 4

I changed the Blogs-Plugin
- Blogs - Joomla - see pic 1
- Preset - Categories: Jedermann-Blog see pic 2

I have configured a Menu link type plugin, plugin blogs, show Blog see pic 3 (only for registered user)

But when clicking on the button on the front page, error-page 404 pops-up.

Thanks for any help.

Don't create menu links to CB Blogs when using Joomla as the storage model. Instead use Joomla content menu links and Joomla will entirely handle the display since blog posts will just be stored as Joomla articles.