According to the free tier, I have 750hours of the load balancer. I would like to try to create more than one load balancer. Now I want to stop it in order to avoid waste the free plan.
But I don't find any "stop" button.
There is no way to stop a load balancer. You have to delete it if you do not need it. The problem is your public DNS id changes, so if you just want to use it without a load balancer then create an AMI.