This image shows the Create Custom Image dialog box.

There is a Help link at the top.

There is text:
"The instance will be taken offline for several minutes during the imaging process.
If the applications that are running on this instance don't shut down in a timely manner, they could be improperly stopped, resulting in data corruption. To avoid this, manually shut down the instance using the OS before you create a custom image."

The Create in compartment drop-down list has sample text.
The Name field has sample text.

There is a Create custom image button, which is surrounded by a red border. There is also a Cancel button.