Think of a lollipop.
The collector pad of the inne STRIP should be placed on top of your tongue. It does not matter if the strip is upside down or right side up - only that it is in contact with saliva for it to absorb.
You only need to have the collector (thin part of the inne STRIP that holds the collector pad) in your mouth. This ensures that the rest of the inne STRIP is free from saliva so that you don't need to get saliva on your fingers during activation of the inne STRIP.
Video Guide: How to make it wet