You will find a red mark now on the top right corner of the cell. While moving mouse pointer nearer to the cell, Excel displays comments whatever you typed just like the above pictures.
Let us know how to manage these comments now.
To edit a comment use Shift Key and F3 function key at the same time.
You can even do by opening the pop-up menu and selecting ‘Edit Comment’ option to make necessary correction. Select ‘Delete comment’ option to delete the existing comment. Select ‘show comment’ option to keep displaying the comment in the screen.
There is a tool bar specially meant for working with comments. You can activate it by selecting comments from View menu.
Info: Always ensure that comments are not disabled in your Excel environment settings. Otherwise you may not able to see any comments even you create.
You can check the current settings for comments from the following path.
Excel => Tool menu => Options => View Tab => Comments => Comment indicator only.