At the moment you can only add users to the application using the CSV Import feature. You cannot update a existing users profile using the same. Alternatively, you can make use of our conventional import feature which helps update a users profile. You would need to create a csv in the specified format for the #userupd command, this format is defined in the data import utility guide which can be accessed below,
Send the CSV file to SUPPORT@REPLICON.COM to import the data into your instance of Web TimeSheet.