The employee profile allows the user to mange key information about themselves.
Here they can manage the email used for Clockworks, and update/change the password used in Clockworks.
For Clockworks to integrate with TFS you must supply a Person Access Token (PAT) to authenticate with TFS API. You can manage your PATs on TFS under your account Security menu option. Once you have created your PAT for a specific TFS server enter that information in the Personal Token and Token Expiration fields. For more information see Authenticate access with personal access tokens for VSTS and TFS
For more information see the topic: TFS Integration