Board Thread:Support Requests - Designing Your Wikia/@comment-25990444-20150420061158

I want to create a similar message like this:



But I don't know how to do it, I have been searching for this on Special:AllMessages and typing MediaWiki pages such "New message", "Newmesaggeslink", etc. but when I change and edit those pages, the message I want to make appear below doesn't appears.

If anyone knows, please, tell me.

Thanks. 