Custom blocks and more block visibility

Hi, it’s Boss

The site is going splendid! I’ve written a welcome message that I would like all visitors to see in big style on top of the front page. The web consultants says that you could use the ”featured” region for this – you maybe understand what they mean, but it's all gibberish to me. The welcome message is included below. Remember: It should only show on the front page! Thanks.

//Boss

PS: The message is “Welcome to our successful site!”