Cyberduck is a GUI program recommended for simple connection to your SFTP account and one-time uploads.
After the file has downloaded, select Open.
Once the program opens, click Open Connection.
Click on the upper dropdown menu and select SFTP.
Enter the Host and Username.
Host: upload.iepanywhere.com, Username: (specific to your district)
Click the arrow next to More Options. Check the checkbox next to Use Public Key Authentication.
Select the text file where you saved the private key.
The screen below will open. From this screen, you will be able to view directories in your SFTP account and transfer files securely if needed.