If you set an Employee as an Administrator, they will have full access to the system.
To complete this task on the Dashboard simply follow the steps below
Log into your dashboard
Contacts > My Employees
Select the Employee via the blue box and press 'edit'
Switch the 'Type' from 'Employee' to 'Administrator'
Enter a Password
Click 'Update Employee'
Administrators will log in using the external link, please read this article to find your external link.