Information about people within a SharePoint organization comes primarily through SharePoint User Profiles. User Profiles are managed by the User Profile Service that comes with SharePoint Server, the pay version, but must be provisioned by the Farm administrator. As part of the provisioning process the Farm administrator creates a special Site Collection for hosting My Sites. In addition to creating the My Sites host the Farm administrator typically configures a synchronization connection with a directory system such as Active Directory. It is from this synchronization connection that User Profiles are populated with information such as email addresses and company information. Users have the ability to add and edit some information to their profiles as well as decide who can view the information. Profile fields that are imported from Active Directory default to read-only and that includes the Show To option. The Farm administrator can change the default edit ability of these fields as well as add new custom fields.
The following walk-through will show you how to edit the profile for the account. This walk-through uses an account named "SP_Admin" but any account will do.
These same steps are performed as part of the exercise with this lesson so unless you have a separate account you want to perform the walk-through steps on, you should wait to perform them in the exercise.