Put blog title after post title in blogger

first, search for this code in your blogger template by clicking ctrl F and pasting the code below:

<title><data:blog.pageTitle/></title>


second, replace the code above with the code below:

<b:if cond='data:blog.pageType == &quot;item&quot;'>
<title><data:blog.pageName/> | <data:blog.title/></title>
<b:else/>
<title><data:blog.pageTitle/></title>

</b:if>