This doesn't really belong here, but I figure a guide is in order to help stop the constant confusion and slow the flow of questions.

iEvony is an application client for Evony. In other words, it is NOT a new game or an expansion pack for the current game.

What it does is provide a rewards program for players to refer new players into the game. You get a unique URL to give out to friends. If they use that to sign up for Evony, you get credits. If they buy game coins, you get credits. You trade your credits in for free Evony game coins. Easy!

There is a downloadable program that will let you send out invites to all the contacts in your email/IM if you like, but it is not necessary to use it.

OK, how to use your code once you get one:

Go to www.evony.com and log in normally.
Above the server list there will be a green button that says "Join Now" or something similar. Click that.
Input your invitation code.
All done! That green button will now have a URL in it. That URL is unique to you and will say something like http://ladyfire213.evony.com That is what you give out to friends to bring them to the game. That is what earns you credits.

Additionally, you will see to the left a link for "More Invitation Codes".
Click this and you get 10 codes to hand out to others. Each time a code is used, you get a replacement to give out. You get no credits for handing out invitation codes, though.