Hi Steve and welcome to the OpenEMS Community!
In step 4 of the Getting Started guide I do recommend you to follow the link:
If you plan to actively develop on OpenEMS UI, you can now also setup a development environment for it using this guide. Otherwise just go ahead with the hosted version:
As you are running everything locally with default settings, UI should try to establish a “ws”-connection and not “wss” (i.e. non-encrypted websocket).
Also there seems to be an issue currently that sometimes causes a blank page. Refreshing the browser tab should help in that case (see Setup IDE for OpenEMS UI: not working - #5 by NiallDarwin). We are in the process to fix this issue.
Regards,
Stefan