You can access Demo platform and give it a try after the registration at DSX. You only need to enter your email and verify it to get an account.
Once you've set a password, you can already access Demo platform.
Click Trade section
You'll get to the trading platform. In the lower left corner you can see the name of the current account. If it is Trading DEMO - you are all set. You can start trading. If you see any other name - click it to choose the Demo account.
That's it. You can now practice at DSX platform.