Here you can link the employee to a user in Astrow Web. Go to Configuration - Employees- New/Edit - tab System - Assigned users,click the button and select the user listed in the new window opened.
Assigning a user to an employee in New/Edit Employee Window in Astrow Web
To add a user, click . Once you named it, you can edit it by adding or deleting permissions, or customize the view in application for a user.
To edit a user, click or double click on it. To delete a user, select it and click .
If you delete a user linked to an employee, also the link is deleted. In this case the employee should be linked to other user defined in order to use Astrow Web. System users cannot be deleted! They can only be edited.
You can also search a user by user name, email or employee name.
and select the user listed in the new window opened. 
. Once you named it, you can edit it by adding or deleting permissions, or customize the view in application for a user.
or double click on it. To delete a user, select it and click 
. 
a user by user name, email or employee name.