AWS Installation Guide
Start by launching a new EC2 instance. This can be done via the AWS Management page. After doing that, you'll be presented with the wizard:
Start by selecting "Community AMIs" and search for MISP-Cloud. The builds are always created with "MISP" and the creation date. Chose "Select" after finding the MISP image (the old images are deleted once a more recent image is generated).
You can also check aws-builds for the latest AMI identifiers and the regions where they are available (I don't make the images available in all regions, but there's still quite a few to select from).
The images are built to run on a t2.micro instance, which falls under the "Free Tier" option of AWS. You're free to select another instance type.
You can accept the defaults and proceed until Step 6 where you'll get to configure the firewall rules (security groups):
MISP-Cloud requires at least 443 (HTTPS). You can always choose My IP to restrict the source to your IP address. After that, you'll be able to launch your instance. Before doing that, however, you need to handle SSH access (even if you don't plan on using it, AWS requires this step to be completed):
The wizard requires that you create (or choose) a key pair. MISP-Cloud does not come with any keys or known_hosts. Launch your instance after performing this step.
After launching your instance, click the instance ID to get further details.
Retrieve the public IP of your instance and connect, via HTTPS, to it.
Check the main page for access details.