My trick :

In the view of blog.post, I added that code in the view just before the </sheet> tag :

    <group string="Contenu">

         <field name="content" placeholder="Ajoutez une description..." widget="html" modifiers="{}"/ >

    </group>

The ' widget="html" ' clause make the field use the html editor instead of a simple mono or multi-line editor.

The id of the view to be modified/inherited is : website_blog.view_blog_post_form

Hi Thomas, i cant answer on your comment, just inform you, that there is a space before the last sign in the code below:

         <field name="content" placeholder="Ajoutez une description..." widget="html" modifiers="{}"/ > wrong!

         <field name="content" placeholder="Ajoutez une description..." widget="html" modifiers="{}"/> correct!

This should work than. it did for me.

So i have another questions regarding Blog pages.

What i dont't understand is that the Menu on the right side isn't shown when i write a blog post.

The post looks just like a empty page with header and footer. Why is the Menu of the Blog system disappeart?

How can i change this?

Thanks