Set author name and comment color in Numbers on Mac
You can specify the author name and color that are used to identify your comments. Each person uses a different color.
Set your author name
You can change the name that appears in the comments you make in Numbers. The new name appears the next time you comment in a spreadsheet and for comments in new spreadsheets, and it changes the name that appears on comments you made previously.
Choose Numbers > Preferences (from the Numbers menu at the top of your screen).
Click General at the top of the preferences window.
Enter a name in the Author field, then close the preferences window.
The name doesn’t apply to spreadsheets that are shared with others. For shared spreadsheets, the name that appears in comments and in the participant list is the name you use with your Apple ID. To change it (without changing your Apple ID), open iCloud preferences (in System Preferences), click Account Details, click General, then type a name.
Important: If you change the name used with your Apple ID, the name appears in all apps and other locations that use your Apple ID.
If you stop sharing a spreadsheet, the author name in comments reverts to the author name you set in Numbers preferences.
Change your author color
Your author color is associated with the comments you add to a spreadsheet. You can change your author color at any time.
Choose View > Comments > Author Color (from the View menu at the top of your screen), then choose a color.
If you have a spreadsheet open, all of your comments in the spreadsheet switch to the new color, and any new spreadsheets you create using the same author name use the new color.
Note: You must add a comment or make a change using the new color to save it in Numbers preferences. If you close the spreadsheet without making any changes, the author color reverts back to the previous color.