If you want to set or increase the hard drive for your virtual machine, then first, you'll need to create an AMI with the necessary volume (click here to review the instructions for how to use custom lab images), It's important to understand, and properly create the image for the event to hold the training's resources.

If you want to add more disk space to the lab, then you'll need to create an AMI and choose how much space to give it. Currently, there's no way to choose disk space without using a custom AMI.