For plant names to be shown on the Dashboard, they need to be the assigned to a combination of hardware that is (or has) communicated with Fatigue Manager.
If the plant names that you've added appear in the Plant list shown in CONFIG->PLANT, you've added them correctly. This is a list of names that can be given to a particular combination of hardware that is (or has) communicated with Fatigue Manager.
When the SmartCap hardware communicates with Fatigue Manager, it will show up on the dashboard as an "unassigned" plant. That is the point at which you can rename that hardware combination with one of the new names you've added.