if you mean Downloadable maps, they are custom unofficial maps made by users.
yo can be alone in your custom map or share it with a friend to roleplay in it.
here you can get a lot of maps:
http://www.feral-heart.com/index.php?option=com_jfusion&Itemid=2&jfile=index.php&board=21.0To install the maps, generally you need to copy all .fhm, .fmo, .fhs, .fhw files in FeralHeart\exports\ directory.
To hide your email, go to your profile (just click in your name at left), the go to "Account Related Settings" and check the box labeled "Hide email address from public"