How do I add the Lock Screen Widgets?

To add a widget to the lock screen, long press on your lock screen and tap on Customize:

Then, from the configuration screen tap on Add Widgets, scroll down, tap on Slopes and choose from My Stats, Resort Conditions and Resort Snow Forecast:

To set a resort for the resort widget, you'll then need to tap on the widget to bring up the resort list. 

Search for your resort, select it, then close the widget picker and tap on Done in the top right hand corner of the screen.