While creating a launch configuration, there is no way to select a community AMI? Only marketplace AMIs come on top. Scrolled for long, but still cannot find a community AMI.
Rather than scrolling downwards to find the community AMI you require, you can filter for the community AMI using its AMI ID.
You can get the AMI ID for the specific community AMI from the EC2 launch instance wizard. See Launching an instance using the Launch Instance Wizard - Amazon Elastic Compute Cloud.