Someone shared a OneNote document with me through Microsoft OneNote Online: how can I add it in my OneNote account? [closed]

Someone shared a OneNote document with me through Microsoft OneNote Online: how can I add it in my OneNote account?

Use case: I don't want to lose the file if the other person removes their OneNote document, or close their associated Microsoft Office 365 account (e.g. which happens when employee leaves a company).

I use Windows 7 SP1 x64 Ultimate, Chrome. I tried Googling the question and couldn't find any official help articles on it.