How can I add a comment to a specific paragraph or a specific selection of a text?

[EduNetEurope]

The help document says:

Once enabled you'll see a new comments sidebar become available. You can add comments to any document or to a specific text selection, we also support threaded replies, notifications, @mentions, basic formatting and images in comments.

We only manage to add general comments.
How can we add a comment to a specific text selection?

Thanks for your help.

[tommoor]

Cmd+Alt+m also works as a shortcut

[EduNetEurope]

Thanks for the quick reply! Sorry for being blind.