If a new page has been created purely as spam, just add {{delete|spam}} to the top. Type SPAM in the summary below the edit box, and click save.
This adds a large notice (so visitors see the warning before they see the spam), and helps bring the page to the attention of Appropedia's admin team, who can delete the page.
Thank you!
We hope to have much easier ways to flag spam, but we don't have a way to do this yet, in MediaWiki.