You can make changes to your interior images from the Writing Tab. Along the right side of the screen, aligned with the top of the image, you'll see a trash icon and a cog icon.
Click the trash icon to delete the image.
Click the Cog icon and a small window will pop up with options to make adjustments to the image like: Caption, Alignment, Wrap, Size, Link.
Note: because many of these options like size and wrap settings will depend on the size and format of the final file, you will not see these changes in the content editor.