Some resources for this class are accessible only within the IU network. If you are not on campus, and so not on the network, you can get onto the campus network by logging into the IU VPN (virtual private network).
To set up the IU VPN, install whatever VPN application UITS recommends now, from the IUware Network & Printing page. As of August 2019, that is Pulse Secure.
Follow the instructions for installing and running the VPN software. Use the software to connect to the IU VPN, then use your browser to access the course web site.