[one type="separate"]
Defaults
Below are the options that are available for this shortcode and their default values. A hash (#) indicates a required value.
'limit' => '6', // Number of posts to display
'id' => '' // Post ID, can leave blank if used within a post
And this is what you should insert into your posts and pages…
[[related_posts limit="6" id=""]]
[/one]
[related_posts limit="6" id="26" /]
[clear /]
[[related_posts limit="4" id="26" /]]