In WonderPlugin Tabs, step 1, I can select a page and add the page content to the tab. How can I add a post to the tab content?
You could enter the following shortcode to the tab content. In the code, 123 is the post ID, please make sure to change it to your own post ID.
To find the ID of a post, edit the post, then look for the post ID in the web browser URL address.