How to Remove an Image From a WordPress Photo Gallery

1. Log in to your WordPress dashboard, and click 'Posts' to see your posts. Find the post you want to edit, and hover over its name to reveal the 'Edit' link. Click 'Edit' to get into the post editing screen.
2. Click the square icon next to 'Upload/Insert' to load the media-uploading tool. Click its 'Gallery' tab at the top to see the images associated with that post. If you inserted a standard, nonplugin gallery into the post using this uploading tool, then any changes you make here will affect the gallery for that post.

3. Click 'Show' next to the image you want to remove. Scroll down until you see the 'Delete' link, and then click there. Click the 'Continue' button that appears to complete the deletion.
4. Click 'Media' on the left-hand menu in the dashboard, under 'Posts.' Click 'Add New' and follow the prompts to upload the file again if you still want it on your server. Now the image will be in your media library but not as part of a post's gallery.