The "Download Now" link directs you to the iTunes App Store, where you must continue the download process. You must have iTunes installed in order to open the link, and you must have an active iTunes account to download the application.
Miab - Message in a Bottle is messaging app that allows you to meet new people from all around the world. By sending out your message in a bottle at random, it can end up on anyone's beach.
You can send your message signed, which will include your profile information, or send your message out anonymously.
If you sign your message people can respond to your message in a bottle. And then you will have the option to add each other to your Friends list.
Looking for a message in a bottle is just as easy. Simply look for a message on your beach and you'll receive a message from someone around the world.
If you like the message you received you can respond to the message and then also add that person to your friends list.