97,
Looking at the input to the pump, you have three valves.. There is an automated valve that is called the Intake valve and it allows you to select either the pool water or the spa water. In your pic the spa is shut off and the pool is open. The next valve to the right is for one of your skimmers.. it is currently shut off. The next valve to the right is for the main drain and is is open. The pipe to the right I assume is your second skimmer which has no valve...
I am surprised by the layout as it does not really give you the control over the two skimmers and the main drain that you should really have.
I would want to make sure that the labels are correct.. No telling who added them...
I am also "assuming" you have two skimmers, just based upon your question. Do you actually have two skimmers in the pool?
Thanks,
Jim R.