How do I let friends access my chests? Run /cmodify <friend> and left-click your chest. You may repeat command this for each chest, or run /cpersist before running /cmodify then click all chests and run /cpersist again once you're done
How do I become Staff/Janitor? This is one of the touchy subjects as we do not run applications to become Staff or Janitor. Janitor is possible but you get asked not the other way around. If you would like to contribute to the server by all means go ahead by helping new players that are struggling to start out and helping players in chat, etc.