For reference, when you get the IDE launched in a browser:
The tab menu on the right has six sections accessible by the icons. These sections are, in descending order: Project Explorer, Examples, Settings, Pin Diagram, Docs, and Libraries. Click the X at the top to open the tabs, and close them when you want them out of the way. I've labelled them below but if you forget what the icons mean, hover over them and a tool tip will appear with the tab name. Feel free to click around and explore those tabs though, there's a lot of useful stuff in there.
The Toolbar is the horizontal strip near the bottom, and contains the major project controls. On the left are two important buttons: Run (click it and it builds and runs your project) and Stop (stops your project from running). The next three square buttons are useful too: The first launches the oscilloscope, the second launches the GUI, and the third clears the bottom console. If you hover your mouse over anything in the toolbar, a little text label will appear near it telling you what it is, but I've labelled them in this screenshot.
The Editor is the window where you can write code. You'll be using PD I take it, so you'll be putting those patches together in Pd on your computer. When your patch is ready to go drag and drop it from the Finder to the IDE in the browser and it'll build and run automatically. The IDE will also visualise your patch for you - open an example in the Pure Data section in the Examples tab to see what I mean, or see the screenshot below.
If you'd like to mess with a pre-loaded Pure Data example, click on one in the Examples tab to open it as a project. Go to the Project Explorer and look at the listed files - one of those will be
_main.pd (all Pure Data projects need a
_main.pd file). You can click the arrow beside the file name to download it (labelled below), then open it in Pure Data on your computer and edit it. When you want to run it, save it and drag from your Finder and drop on the IDE in the browser. The IDE will automatically upload, build and run it for you.
Let me know how you get on, and fire any and all questions!