How can I use multiple lights at the same time?

You can use multiple lights simultaneously by creating a group in the app. For example, a group of lights in your living room, or multiple spots in your bathroom.
Go to My Family (bottom left side) > Choose the first light you want to add to the group > Go to Menu (top right) > Create group > Check the devices you want to add to the group > Confirm.
Now you can rename your group so you can easily recognize it.