Change title tags in blogger

Go to Layout then Edit Html

Search for this tag <title><data:blog.pagetitle/></title>

Replace this tag with Following tag- 

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