An easy way to add a previous post page link in the top of your blog (classic template):
« Home | Previous Post Title »
Just paste the code below before the <Blogger> tag.
<ItemPage>
<p style="text-align:center">
« <a href="<$BlogURL$>">Home</a>
<span><BloggerPreviousItems> | <a href="<$BlogItemPermalinkURL$>"><$BlogPreviousItemTitle$></a> »</span><span style="display:none"></BloggerPreviousItems></span>
</p>
</ItemPage>
