How to add a comment

1. Select the cell or a range of cells that you wish to add a comment to.
   
2. Navigate to Insert > Comment > Add Comment.
   
3. Add a comment in the dialog and click Ok.
   
4. Alternatively, go to the Review tab and click New Comment to add a comment.
   

How to edit a comment

1. Go to the Insert > Comment > Add comments.
   
2. Click on the drop-down menu of the comment you'd like to edit.
   
3. Click on Edit.
   
4. Make the changes to the comment.
   
5. Click Save to publish changes, or Cancel to discard them.
   

How to reply to a comment

1. To reply to a comment:
   
2. Click the Reply button below the comment you want to respond to.
   
3. Enter your reply.
   
4. Click Add.
   

How to edit a reply

1. Hover over the reply you want to edit.
   
2. Click the Edit icon in the top-right corner of the comment.
   
3. Make the changes.
   
4. Click Save to publish, click Cancel to discard. 
   

How to resolve a comment

1. Click on the drop-down icon on the comment that you want to resolve.
   
2. Click Resolve. 

How to manage Email notifications for comments

1. Navigate to Insert > Comment > Settings > Notification settings.
   
2. Toggle the buttons to enable or disable notification for the comments.
   
3. Select whether you wish to receive notifications for all the comments or only where you've participated or been mentioned.
   

How to highlight a comment

1. Go to Review > Highlight Comment 
   

A dotted red border will appear to the range the comment has been added.