Click on the "Sign up" button to create a new account:
Once you have created an account, you should see a page that lists all your flows (3 sample flows are pre-populated in the Trial package):
Click on the "Create Flow" button, drag&drop components from the left palette to the canvas and connect them together by dragging lines from output ports of components to input ports of other components:
Our first flow contains the OnStart component that fires immediately when you click on the "Start Flow" button, GetCurrentWeather component that requests current weather information from the http://openweathermap.org API and CreateTweet component that creates a new tweet. The right panel tells you what is the missing required configuration for the flow to be able to start. In our case, we need to authenticate to Twitter. Click on the Twitter component and fill in all the details. As you can see in the Inspector, we're entering the text of the tweet. You can use the "variables picker" to insert placeholders containing data from components back in the chain of connected components. These placeholders will be eventually replaced by real data once it is available (when the flow runs).
Then fill in all the details for the GetCurrentWeather component (in our case, we enter the city name):
Now we're ready to start our flow by clicking on the "Start Flow" button. Once you do that, you'll see the Designer shows you the flow is now in the running state. In this state, the flow can only be viewed but not edited. If you want to change the configuration of your flow, you have to stop it first and start again.
Congrats, you run your first flow! Now when you visit your Twitter account, you should see a new tweet: