Automatic pressure cookers?

[JennsPeeps]

I just bought a 12-qt Mirro pressure cooker that's got 5-, 10-, and 15-lb "automatic" pressure settings. How do I set it? I need to can some asparagus tonight but have no idea how to ensure that it's being canned at 10-lb pressure.

Thanks!

 

[DuckLady]

Mine has a little disc that goes on the steam outlet valve on top. There are three holes in it and one is for each pressure setting. You chose what pressure setting you want to cook at and that is the hole you place on the valve.