Just comment down if you want to join and spread the news...
You don't need to ask for premission, just say you're joining and you're in.
I don't know how to make my army or some sort, so it would help if you gave suggestions on what to do...
Official Chat:
https://www.minecraftskins.com/skin/14196762/creeper-army-chat/
Suggestions go here:
https://www.minecraftskins.com/skin/14205744/creeper-army-suggestions/