Step 6: Add the following code just after <data:post.body/>
<b:if cond='data:blog.pageType != "item"'><br />
<a expr:href='data:post.url'>Read more!</a>
</b:if>
Here are the related screen shots for steps 5 and 6:
Step 7: Go to your post and implement the <span class="fullpost"></span> tag (the same procedure and technique with the Classic templates discussed previously).