To create an image/AMI from one of your instances, follow the steps below:
- From the Dashboard click on Cloud Servers
- Click on the instance that you want to create the image from
- On the General Info tab of the server details click the Create Image button
- In the pop up box enter a name for the image, then click Create Image
Please not that it may take some time to create the image, but when it's done you'll be able to select it in the My AMI's section of the Add Server wizard.