what is "Code must be enclosed in preformatted formatting"?

I don't know about this statement. But generally while submitting articles to boddunan always copy it from notepad and not any other editor to avoid formatting problems.

You have a formatting combo box located in the toolbar of boddunan editor. If you open the combobox, you can find the "preformatted" option in it.

Select the source code that you want to make preformatted and select the "preformatted" formatting from the combo box.

Alternatively, you can edit the source of your article and enclose source code within <code> and </code> tags.