Comments include the author’s name, and the date and time the comment was written. Comments are color-coded by author.
Select the cell you want to add a comment to.
Click Comment
in the toolbar, then type the comment in the box.
Click away from the box to close it.
Move the pointer over a cell to read its comment. To see the previous or next comment, click the left or right arrows in a comment. To delete a comment, click Delete in the comment.
To change the author name, choose Numbers > Preferences (the Numbers menu is at the top of the computer screen). Click General, then type a name in the Author field.
To change the author color, choose View > Comments > Author Color, then choose a color.