Set your author name and color in Numbers for iCloud
You can choose the color used for comments and for the cursor that’s shown when you’re editing a shared spreadsheet.
You can also change the name shown in comments, but only for spreadsheets that aren’t being shared.
In shared spreadsheets, you can’t change your name in Numbers for iCloud; however, if you change your iCloud account name in iCloud System Preferences (on a Mac) or in iCloud for Windows (on a Windows computer), it’s reflected in your comments and participant list in Numbers for iCloud.
Set your color
With a spreadsheet open, click the Tools button
in the toolbar, then choose Preferences.In the Author Settings section, click a color.
The color you choose is used for your comment bubbles, and for the editing cursor and dot beside your initials in the participant list in shared spreadsheets.
Colors used in any spreadsheets that are currently closed are not affected by the new color choice.
Click Done.
Set your name for comments in spreadsheets that aren’t shared
Open a spreadsheet that’s not being shared, click the Tools button
in the toolbar, then choose Preferences.In the Author Settings section, type a name in the name field.
Any new and existing comments are updated to reflect the new name.
Click Done.
Set your name for shared spreadsheets
To change your name as shown in your comments and in the participant list for your shared spreadsheets, you need to change your iCloud account name. By default, the iCloud account name stored in iCloud preferences of System Preferences (on a Mac), or iCloud for Windows (on a Windows computer), is used in shared spreadsheets.
To change your iCloud account name, visit the Apple ID account page. After you sign in, click Edit to the right of your account information, then make your changes and click Done.
The name you enter appears on all your devices where you’re signed into iCloud using the same Apple ID.
Note: In shared spreadsheets where you’re not the owner, you can change your name as it appears in the participant list only if the spreadsheet’s access is set to “Anyone with the link” and you’re not signed in to your iCloud account; in this case, the name you enter when you join the spreadsheet appears in the list.