The e-ticket is largely for decoration. You need to follow the link to print your boarding pass. That's the bit that will actually get you through security and on to the aeroplane. With most airlines, the boarding pass downloads as a pdf which you can save and print off as many as you like. Make sure you print it "actual size". If it's scaled, the machine at security won't be able to read the QR code.
If you have hold luggage, take that to the bag drop desk along with your boarding pass and passport. If you have only cabin luggage, you can go straight to departures. Your bit of paper might not look like the type of boarding pass we all know and love, but the scanner on the security gate will read the QR code even if it's on your phone.