Very few of our resources are freely available to any web user. If you're at home, the easiest way around this problem is to sign into the University's SVE service.
Another option is to set up VPN on your device. iSolutions provide guidance on how to set up VPN in this article
Alternatively, some resources may have an "institutional" or "Shibboleth" login option. Use this and log in with your University username and password.