How do I join a Nation?
You can join Nations from the NationFinder.
You can also Join or Apply to Nations from Nation Discussions, like so:
If you're invited to a Nation, you can accept the invitation directly from the Inbox menu by clicking the green '+' icon next to the invite.
If you visit the column of a Nation you've been invited to, you can accept the invitation there, too - you'll see a message at the top of the screen saying so and offering 'Accept' and 'Reject' buttons.
If the Nation's an Open Nation, you can click 'Join' on the Nation's column page.