In this step you must choose the security group that you created and assigned to your EC2 instance where Taskforce.sh is running.
You may also need to add a security group to make your load balancer accessible. For example for a public-faced Taskforce.sh dashboard you would define a security groups with the following inbound rules:
Step 4. Configure Routing.
Just leave the settings on this step with its defaults, but port 4200 and just name the target group to something like taskforcesh-target.
Step 5. Register targets.
Choose the EC2 instance running Taskforce.sh, target port 4200 and click on "Add to registered".