What action can you take to modify a user's first and last name?

To modify a user's first and last name, the correct action is to click on the option that allows you to edit the user's name. This action directly pertains to changing the identifying information of the user, which includes their first and last name.

When managing user accounts in a system, modifications such as name changes typically require accessing specific settings related to user identity. In this case, selecting the option to edit the user name provides the necessary interface where those details can be updated.

The other actions listed do not pertain to changing a user's name. Editing an email address involves adjusting contact information without affecting the user's identity through their name. Resetting a password focuses on security management and does not alter a user's personal information. Assigning new roles is related to permissions and access levels within the system but does not impact the actual name associated with the user account.