MediaWiki:Spamprotectiontext

Your edit was not saved because it contains a new external link to a blacklisted website. To save your changes, you must go back and remove the blocked link, and then save.

Note that if you used a redirection link or URL shortener (like e.g. goo.gl, t.co, youtu.be, bit.ly), you may still be able to save your changes by using the direct, non-shortened link - you generally obtain the non-shortened link by following the link, and copying the contents of the address bar of your web-browser after the page has loaded.