The notebooks must be run from top to bottom. Place the cursor in the first cell and either click theicon, or by using the keyboard shortcut SHIFT + ENTER.
This is showing a busy notebook with the background cell green and the full circle at the top right corner of the notebook.
At least one time per notebook, you will need to select a folder or one or more files. This widget will look like this
The UI is pretty self explanatory but you just need to know that:
In the file/folder listing widget
The file or folder will be really selected only once you have clicked the Select button at the bottom right corner.
To select more than one file (when this option is available), CLICK first file then SHIFT + CLICK the last one. Or ALT + CLICK to individually select each file.
The cell is then executed and depending on the contain of this one, you may see or not an output to the cell. The output is always displayed just below the cell ran. In some of our notebooks you will see widgets that you will need to interact with. Here are a few examples of widgets you may encounter in your notebook.
In some notebooks, the output may even show up in the back of the notebook (the default cell output will give you a message that let you know where to look). Those outside widgets are more complex user interface such as the one shown here.