Automations will run top down. So the automation at the top of your list will run first followed by the next and the next. To change the order of the Automations find the 2 bars next to any Automation and drag it to the appropriate location.

On the right hand side of the Automations page you will see 3 buttons next to each Automation. A Pencil icon to edit an Automation, a Pause icon to pause an Automation(this automation will be skipped until it is no longer paused), and a Trash Can icon to delete an Automation