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Do so by tapping the back button in the top left corner of your screen until you reach the profile page, then swiping up on the screen. After a brief moment, you should see icons pop up to the right of the camera button. If your camera isn't already facing you, tap the camera icon in the top right corner of your screen. If you're applying the face filter to yourself or a friend, tap on the face to which you want to apply the filter. Once you settle on a filter, you'll be able to record with it enabled. Some effects will change your voice if you speak with them enabled. These effects will briefly display "Voice Changer" on the screen when selected.

Summary:
Return to the camera screen. Tap and hold your screen. Swipe right to scroll through the available effects.