Are you trying to add this information to all the contacts at once or just to individual contact records?
If you would like to add the names to everyone you can do so by uploading the file again. The name information will update for any contact that matches email address.
If you would rather update one at a time you can do so by clicking into the contact details and then clicking on the name information area. You will see that the area of the account opens up for you to edit.
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