This topic goes over how to use custom widgets:
https://community.openhab.org/t/custom-widgets-feature-walkthrough/16670
The basic steps are:
- Open the custom widget management page
- Import the widget (if you have a version of HABpanel that supports GitHub import, then enter “jmsjones/habpanel-widgets” for the repository name)
- Click on the widget name
- Select the “Preview” tab
- Edit the preview settings using the gear icon in the top left corner
- If the preview is working as expected, then add the widget to real screens as needed
If you continue to have issues, please share your settings for the widget. Please provide the version of openHAB you are running as well.