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You can unlock Whitelisted Players for free. You can find and enable Whitelisted Players in the Optional Features list of the app.
By enabling the whitelist, only playernames that are on the whitelist will be able to join your server. Use the User Login plug-in when you want to make sure that only your friends are able to log in.
This feature is very useful for server owners that would only like to allow a small group of friends to be able to join the server, and not allow login for any random players.
Have a question about the plug-in Whitelisted Players? Ask it on the forums here!