Drag and drop the plugin into the lobby template (inside /local/templates). If you are using a different alias for your lobbies, e.g. hub, you can change that in the config.yml the plugin will generate on first start.
Restart the server
After that you can join and you should be able to see the default emerald in your inventory. This can be configured in the config.yml file.
This plugin is 1.8-1.15 compatible, but you'll have to change the material names according to your version. Let's take an example with wool : in 1.8, inventoryItem (in config) needs to be WOOL:0 while for 1.15 white wool is WHITE_WOOL. Please refer to this list for more information: https://hub.spigotmc.org/javadocs/spigot/org/bukkit/Material.html
Code (Text):
cloudnetLobbyTaskName: "Lobby"
### JOIN ITEM CONFIGURATION
giveItemOnJoin: true
joinItem: EMERALD # Please use a material from this list (Materials change depending on your version): https://hub.spigotmc.org/javadocs/spigot/org/bukkit/Material.html
joinItemSlot: 8
joinItemName: "&6&lSelect your lobby"
joinItemLore:
- ""
- "&9Select from one of our other lobbies"