Forget the web app, and let a fantastic product interface with it instead to earn you coins automatically! The FIFA Ultimate Team Millionaire Autobuyer can make you coins as you sleep. Check out my full review here.
If you do any kind of FIFA 13 Ultimate Team trading, then you definitely want to familarize yourself with the web app. The FIFA 13 UT web app allows you to do different administrative tasks with your Ultimate Team. Most importantly, you can access the market and trade, using your trade pile and everything like you are normally able to on your console.
The FUT 13 Web App, like its predecessors, is a flash application. This means a few things, one being that it is highly difficult to produce applications that run off of it. It is nearly impossible to build any kind of proprietary mobile or web application that allows you to trade. Also, because iPads and iPhones do not have flash capability, you will either need to download the Puffin Browser or use one of the available Ultimate Team apps.
You can log in here and if you haven't already, you can set-up your account on that page as well by clicking the 'register' link at the top. The accounts are powered by Origin, so you may already have one! If you are setting up ana ccount now, I'd highly suggest writing down both your password and your secret question answer so you don't forget.
The web app is extremely useful for making money with trading. You can buy a lot of cards at once because it's much easier to navigate than it is on the console. I'd like to take a moment here to tell you about my very favorite FUT guide, the FIFA Ultimate Team Millionaire Guide. Some of the methods in there (which are incredible, just read my full review ) really work well with this whole attitude of spend a little time buying players and throwing them back on the market. Combined with that guide, the web app is your key to millions.
If you've played FIFA at all before, you've probably come to not really expect much from the EA servers. This is no different with the web app, in fact, it's worse! You'll get disconnected every once in a while for seemingly no reason at all, and it goes down for service a lot. This can be especially annoying if you're trying to do the 59th minute method.
One question you may have about the web app is: Can I buy packs? The answer is yes! You can use both coins and FIFA points to purchase packs through the Store, with everything priced just as it is in the console version of the game. However, it is impossible to purchase FIFA Points with money (like you are able to on the consoles) at this time.