In the footer of each Experiment page is a button to add new Notebook entries. Give your entry a title and start typing!
In the Entry toolbar you have the option of setting formatting or adding special widgets such as spreadsheets, math formulas, and checkbox to-do lists.
In the Entry's header bar is where you can find the commenting button.
Click the button to open the comments window. To notify another lab member in your comment mention them by typing '@'. A list of lab members will show up and click on their name. Once you save the comment, the message will be emailed to that Lab Member. Use the pin icon to reference a specific line in the entry.
Next: Action Items