Please Login to your Blogger Account, and go to Dashboard, Layout, and Edit HTML.
Because we will edit the HTML code, you need to create a back up for your template, click Download Full Template.

Check Expand Widget Template

Now, find this code : <div class=’post-body’> or <div class=’post-body entry-content’>

Copy paste this code under the code above :

<b:if cond='data:blog.pageType == "item"'>

<style>.fullpost{display:inline;}</style>

<p><data:post.body/></p>

<b:else/>

<style>.fullpost{display:none;}</style>

Look under that code you will find  : <p><data:post.body/></p>

And paste this code below :
<a expr:href='data:post.url'>Read Full Entry</a>

</b:if>

click Save Template.

Than go to Setting, Formatting, and find Post Template area,

paste this code below :

<div class="fullpost">

</div>

Done, click Save Setting.

Now if you want to post, write in edit html. The text before <div class=”fullpost”> will be appears in your post, and the text after that code will be appear if you click the readmore link.
You must write like this :

Click Publish Post.

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