Nasal strips are simple to use, and almost every problem people have with them comes down to the same thing. The skin was not quite dry.
Prepare the skin
Wash your face and dry it properly. Properly means dry to the touch, not towel damp.
If you use moisturiser, serum, or any facial oil in the evening, the strip goes on before those, not after. Adhesive does not hold to a moisturised surface, and this is by far the most common reason a strip lifts overnight.
Where it goes
Across the bridge of your nose, centred, with the widest part of the strip sitting over the widest part of the bridge.
Peel the backing away, place it, then press gently along the whole length with a fingertip. Give it a few seconds. Adhesives bond better with a little warmth and light pressure than with one firm push.
One strip per night
Each strip is single use. The adhesive is designed to hold for one night, and a strip that has already been worn will not sit flat or stay put.
Thirty strips to a pack, so a pack is a month.
Taking it off
Peel slowly from one end. If your skin feels tight, a warm damp cloth held against the strip for a few seconds loosens the adhesive and makes removal easier.
If you have sensitive skin
The adhesive is gentle and latex-free, but any adhesive can irritate some skin.
Patch test first. Apply a small piece somewhere less visible, leave it a few hours, and check for redness. If any irritation occurs, stop using it.
Do not apply to broken or irritated skin.
Storing them
Cool, dry, out of direct sunlight. Heat is the enemy of adhesive, so the glovebox of a car in a Queensland summer is the worst place you could keep them. The Travel Tin exists partly for this reason.
For external use only. Not intended to diagnose, treat, cure or prevent any condition.