You need to take care of the treads risers and stair noses which can get a bit complicated at times.
How to install laminate flooring on stairs.
Installing laminate flooring on stairs can be tedious and time consuming and is a lot different than installing laminate flooring on a floor.
Most often you will have carpet on your stairs and you need to remove it first.
It can have tack strip and a lot of staples.
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Laminate flooring installation on stairs.
To install laminate flooring on stairs start by removing the overhang or the underside of the stairs with a jigsaw.
Once this is done measure and cut out your pieces of laminate to make tread pieces riser pieces and stair nosing.
Things i mention in this vid.
Alternatively you could cover the overhang with plywood to make it level.
Watch how to install laminate flooring on stairs video.