To be quite honest, I have an average computer and it runs terribly on armor games but I used to play it all the time with the SAME COMPUTER but from their actual website with no trouble. So I think it's armorgames website that slows it down.
How to join a guild: Near the market in Crab Coast there is a man behind a desk who will show you all the open guilds you can join. You can also be invited to a guild by a high ranking member of that guild.
/guildleave will make you leave your guild and return your guild donation to you.
Is this Final Fantasy Online? Not in the slightest. As far as I know, there is absolutely zero relation between the two games.
If you are having computer problems:
Try Clearing your cache Close any other windows you have running Update flash player Try with another browser Try playing on the main site
If those don't work then you must have a computer older than I am.
I highly recommend you visit the official Fantasy online forums if you have any more questions. There's loads of info there and it's fairly active.