Here is how to hide images within a blog post or page on your site. You won't need the code view for this to work, the visual editor will work fine.
- Edit the page and click on the image you want to edit
- On the small menu that appears, click the pencil to edit it.
- On the edit screen that appears, click "Advanced Options" to display more fields.
- In the "Image CSS Class" field, type "hide" (be sure it is all lowercase)
- Click "Update" to save the image settings
- Click "Publish" or "Update" to save the page