Private warps are per player, and only the player who created it can teleport to it. It's useful for example to set homes.
Public warps, or poi's (points of interest) are global and everyone can teleport to them. It's useful for example if a player has a shop and wants other players to visit their shop.
This type of warps can have teleport signs. Simply create a sign and write [poi] in the first line and the name of the poi in the second line.
Map integrations
This plugin supports DynMap and BlueMap to display points of interest on your server's map. If you have installed one of these plugins on your server, it should work automatically.
Economy support
You can configure costs for creating (and deleting) warps and poi's. For this to work, you need to have Vault and an economy plugin installed on your server.