An automated filter has detected that you have added a protection template to an unprotected page. Adding such a template does not cause the page to be protected; only administrators can protect pages. Furthermore, the addition of such templates to unprotected pages causes the page to be placed in a maintenance category, and other editors must then come along later to remove the template.
To request that this page be protected, go to Wikipedia:Requests for page protection and follow the instructions there. Be aware that except for a few cases, pages are not protected preemptively.
Be aware that if you are editing logged-out (under an IP address) or if your account is not yet autoconfirmed, protection will prevent you from editing the page as well.
If you are not aware of having added a protection template to this page, you may have inadvertently copied and pasted it from another page.
If you copied and pasted from another page to obtain the basic structure for a new article, check the code for a protection template (it probably begins with {{pp-) and remove it before saving the page again.
If you have cut and pasted an entire article from one title to another in an attempt to rename the page, please do not do so. Cut and paste moves break the page history and the attribution required by our license. Use the "move" tab at the top of the page (it may be in a drop-down menu next to the search bar); if you do not see the "move" tab or if the move may be controversial, follow the instructions at Wikipedia:Requested moves.
If you did not add a protection template to this page, whether intentionally or unintentionally, report this error.