H1 as page title

Can you link me to the page possibly?

my website is http://www.androidicecreamsandwich.de/

Nice site!

You're right, the blog page doesn't have a title.

Do you have our Page Header add-on? If so, go to "Appearance > Blog Page Header" and add this in the "Content" box:

<div class="grid-container grid-parent">
    <header class="entry-header">
        <h1 itemprop="headline" class="entry-title">Blog</h1>
    </header>
</div>

now i have Android-Ice Cream-Sandwich twice on my site

Is that what you replaced "Blog" with in the code I gave you? You can add anything there you like :)

this is what i have insert in blog page header -> content

`<div class="grid-container grid-parent">
<header class="entry-header">
<h1 class="entry-title">Android-Ice Cream-Sandwich</h1>
</header>
</div>

<div class="grid-container grid-parent">
    <header class="entry-header">
        <h1 class="entry-title">Android-Ice Cream-Sandwich</h1>
    </header>
</div>

itemprop="headline" is missing at my blog

If you want the itemprop="headline", you would use this:

<div class="grid-container grid-parent">
    <header class="entry-header">
        <h1 itemprop="headline" class="entry-title">Android-Ice Cream-Sandwich</h1>
    </header>
</div>

If you don't want it to say "Android-Ice Cream-Sandwich", you can change it to whatever you like.

What we're doing is adding an overall H1 for you entire blog.

You don't want your individual blog titles to be H1s, as you're only supposed to have one on a page.

If each blog post title was an H1, you would be dinged by Google for having too many.

<div class="grid-container grid-parent">
    <header class="entry-header">
        <h1 itemprop="headline" class="entry-title">Android-Ice Cream-Sandwich</h1>
    </header>
</div>

but when i save it, itemprop="headline" is not been saved and missed

http://www.androidicecreamsandwich.de/

Android-Ice Cream-Sandwich is shown twice

I'm only seeing it once below the navigation?

Unless you mean your site title as well?

In that case, why not give the Blog a different title?