To schedule a new livestream, you first need to log into the Dashboard. You find the Dashboard at this link.
Once in, go to Stream Panel > Schedule a new stream.
Enter a name, price and description for your stream. All fields are mandatory, and makes it easier for your viewers to understand what it is that you will stream.
Choose a start time, end time and if you want to enable the Chat, Ads, Publish afterwards and choose if the stream is a private stream. To better understand what the different options are, check out this article that explains the terminology.
Upload a thumbnail, to make the livestream look good on your channel and social media. You could also do this later. A thumbnail is not required.
Click on "Save stream", and your livestream will be published on your channel with the information you just entered.