How do I delete a 360 image from Roundme tour?

To delete a panoramic image:

1. Log in to your Roundme account;
2. Open the tour you'd like to update;
3. Switch to the edit mode;
4. Click the panorama you would like to delete and hold the button. 
5. Drag and drop the panoramic image to the 'Remove' area in the upper part of the screen:

Please note that your panorama is deleted with all the additional content you add (Hotspots, Portals, locations on the map) ant there's no option to recover it.