How do you change the default Multicraft ftp IP?

A friend of mine installed multicraft on a dedicated Ubuntu server a couple of weeks ago. Everything's been working fine but I can't connect to with

Multicraft Daemon Error SpigotMC - High Performance Minecraft

How To Upload and Download Files with FTP Access

Installing Multicraft on Debian

Configure or Disable Spawn Protection for Your Server - Knowledgebase - Shockbyte

Multicraft install including Web Server, PHPmyadmin and SQL on Debian Linux

How to back up your world using Multicraft's built-in backup system - Knowledgebase - GGServers Ltd.

Installing Multicraft on CentOS 6 - PureVoltage Hosting Inc.

Multicraft Problem with FTP SpigotMC - High Performance Minecraft

How do I FTP into my minecraft server ? Gaming: Minecraft Servers Knowledgebase @ Astutium Ltd

Multicraft install including Web Server, PHPmyadmin and SQL on Debian Linux

Multicraft: No daemon detected SpigotMC - High Performance Minecraft