, tap Settings, then tap Author Name.
Comments include the author’s name, and the date and time the comment was written.
Select the cell you want to add a comment to, then tap Comment.
You can’t add a comment to a blank cell.
The first time you add a comment, type the name you want to appear in your comments, then tap Done.
Type the comment in the box, then tap outside the comment to close it.
Cells with a comment have a colored corner. To read a comment, tap the cell, then tap Comment.
To see the previous or next comment in a table, tap the left or right arrow in a comment. To delete a comment, tap Delete.
To change the author name, tap , tap Settings, then tap Author Name.