Hi Don,
Thank you for reaching out and thanks for using Crio Pro WordPress theme!
If you’re using a BoldGrid “Gallery” block to add your gallery you can click anywhere on the gallery to bring up the “edit” gallery options (pencil icon). From the “Edit Gallery” interface you can remove images from the gallery by clicking the “close window” icon at the top right of each image.
To delete an image permanently click on the image you want to delete then use the right sidebar to scroll down until you see the “Delete Permanently” button. This option will delete the image from your website altogether.
I hope this helps. Please let us know if you have any other questions for us.