if it fails the first time, maybe its already loaded? and you unload it? Most things are already included in VeryVanilla already.
And if you look in the mq2posse plugin thread, you find most info needed
INI:
Commands
/posse - Lists command syntax
/posse on|off - Toggles checking of new pc's. Default is OFF
/posse status - Shows the current status and settings
/posse load - Loads ini file.
/posse save - Saves settings to ini. Changes DO NOT auto save.
/posse add NAME - Adds NAME to friendly list.
/posse del NAME - Deletes NAME from friendly list
/posse clear - Clears all char names.
/posse radius # - Sets check radius to # (ex: /posse radius 300).
/posse list - Lists current names and commands.
/posse notify on|off - Toggles notification alerts. Default is ON.
/posse friendnotify on|off - Toggles notification alerts for friends. Default is ON.
/posse strangernotify on|off - Toggles notification alerts for strangers. Default is ON.
/posse guild on|off - Toggles ignoring guild members, meaning guild members are invisible to all checks. Default is OFF.
/posse audio on|off - Toggles audio alerts. Default is OFF.
/posse testaudio - Test plays the audio alert.
/posse cmdadd "COMMAND" - Adds COMMAND that is executed when a stranger is near
/posse cmddel # - Deletes a command that is executed when a stranger is near
plugins (which need to be compiled, but You dont need to do that since they are included in VV) go in the Release folder and macros go in the macro folder, ini can be modified with a text editor, I use notedpad++