Control Panel - Automation ISO
Here you can see the list of custom ISOs. You can download the list in CSV and PDF format. If you want to add a new ISO click on the gear icon.
Add Custom ISO Image: You will be asked for image name, URL, datacenter(the region where you want to upload this), and add tags.
Custom ISOs: Here again you have the list of scripts but there you are allowed to delete the custom ISO image by clicking on the trash icon. Uploading custom iso costs $0.10 / GB / Month.