Once the VM is provisioned (following the step How to provision Rancher Manager from Morpheus), you need to configure NGINX Proxy manager initially.
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If you have a remote desktop server already set up in the tenancy, connect to it (e.g. via x2go) and open a web browser (e.g. firefox). Check How to use X2Go to Connect internal VMs with GUIx2go remote desktop section here: EUMETSAT tenancy: Default setup.
At the end you should be able to access this URL from the browser: http://<VM_PUBLIC_IP>:8200 or http://<vm_name>.<tenancy_name>.<host_parameter>ewcloud.host:8200 (for more info on the DNS record for your VM, check EWC DNS)
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Now you are ready to create proxy host: How to add a new proxy host for specific domain