According to chapter 2.1, it's unclear how to get the certificates for your browser, in order to access Che.

The solution, we discovered, was to:

• login into the cluster using "oc login"
• execute the command "oc get secret router-ca -n openshift-ingress-operator -o jsonpath="{.data.tls\.crt}" | base64 -d"

The result can be saved as a certificate and imported into the browser. However, regular users (without cluster admin rights) may not be able to access this – the process in such a case is unclear.