It's open source my friend. Support is from the community. There is FlowFuse if you want to pay for support.
This is automatic due to the way that websockets work. They piggyback off HTTP(S). So if you use HTTPS for Node-RED itself, the Editor will use WSS. However, also note that it is possible to move the TLS processing to a proxy relieving Node-RED of the overheads, but assuming you aren't using a VPN into your cloud server, you would be accessing the Editor via HTTPS external to Node-RED itself - the websockets would still be using WSS but the proxy would be responsible for the translation back to ws before forwarding to Node-RED. This is why an understanding of the cloud architecture is necessary - it is quite likely to be doing things for security and efficiency that need to be taken into account.
