Hello @TamiD0 ,
Are you asking how to delete an image out of an email, or your library?
For deleting an image in your emails, simply select the image block, and either click the trash can in the pop-up menu, or Replace if you want to select a different image to be in that block.
If you're wanting to delete an image from your Library, you can select its checkmark box and click Delete at the top of the Library list. Then go into your Library's Trash, and permanently delete from there.
If you're needing an image deleted out of some other source, can you please elaborate on what source you're needing an image removed?