The Sims Wiki:Report

Spam, such as advertising links and vandalism, is strictly prohibited on The Sims Wiki. If you see any, please report it to the administrators by using the Report a problem with this page at the bottom of each article. Alternatively you can contact an administrator directly using their talk page.

You can also undo spam or vandalism edits yourself, using the undo feature in a page's edit history, but be sure to alert an administrator as well so that an administrator can send the user a warning or issue a temporary block if necessary.