Here're the steps to create additional admins:
Go to Contacts.
Click on Add new contact.
Choose administrator from the Usertype on the left sidebar.
Enter the required fields.
Click on Save on the top right.
On the left sidebar, enable Admin Staff role under the Roles.
To send credentials to the new admin, click on Send credentials to send the email with login details. He/she has to use these credentials to log in to the dashboard and to manage the platform. Dashboard can be accessed from here: https://dryfta.com/log-in-to-your-dashboard/