how to delete images

Apologies I’ve figured out how to delete in categories, but I still would like to know how to delete tabs or images in tabs. Thanks

https://docs.google.com/file/d/0B9SdFwKXKrDjTVA0YVFDdk92YmM/edit?usp=drivesdk

see the remove tab link on the right of each tab? This is how to remove tabs.

When you set tab parameters – you can choose category of images, wp user, and tags. To remove image from tab you need assign to image different category or remove tag, so query will not grab this image.