Stoplights can be found beside the 'Edit' or 'View Source' button on most of the pages on this Wiki. They represent the level of protection that is present on that page.
A green light means that it is a community page and can be edited by anyone who has a Wikia account.
A yellow light means that you need to be a registered member that no longer has the "new editor" tag next to their name on their user page in order to edit that page. The "new editor" tag is removed 4 days after you join the wiki.
A red light means that you need to be an Administrator to edit that page. A page is typically given this level of protection because it is considered to be complete.
Note that while user pages are not typically protected, it is generally considered to be polite to obtain that user's permission before editing their personal page. If you have any questions, please ask one of the staff members for assistance.