If you want to buy a ticket, you should choose event and click on it's avatar. On opened page you should click button "Buy ticket"

On next page you should choose the type of ticket you want to purchase, its quantity and enter your email address. The tickets will be sent at it. 

When you done with all fields choose payments method: Credit card or PayPal. Next you will be transferred to payment system where you should follow all instructions it provides.

After payment tickets will be sent to your email, and will appear in “Purchased tickets” of your personal profile on our site and in your mobile application (if you haven't installed it yet, we recommend you to do so Radario for iPhone).