You can show the fields with automatic plugin or follow this instructions.
Now, we will create a com_content template, the single article template.

In this case the id of extrafield is 1, we can get this number in the extrafield list.

In the template folder we create a file html template.

For example: /templates/[our template]/html/com_content/article/default.php 

Download and paste this file in your template folder. REMEMBER EDIT AND WRITE THE CORRECT ID EXTRA FIELD.

It's all.

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