Unable add attributes to agent creating basic HTTP client

When following this guide (https://github.com/openremote/openremote/wiki/User-Guide%3A-Connecting-to-a-HTTP-API) to create a test asset with the Docker Hub containers pulled down and running locally I am unable to add atrributes as the menu is empty. Am I making a basic mistake or is something wrong with my local setup?

Below is how it looks.

openremote

The guide is referring to the legacy manager setup, which is currently phased out. The current manager might still have some glitches here and there. You can still call the old manager UI by explicitly following the /manager endpoint, e.g. https://demo.openremote.io/manager
You should be able to add attributes following this path.