Most often you will have carpet on your stairs and you need to remove it first.
How to install laminate flooring on stairs.
Things i mention in this vid.
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It can have tack strip and a lot of staples.
To install laminate flooring on stairs start by removing the overhang or the underside of the stairs with a jigsaw.
Watch how to install laminate flooring on stairs video.
Step 1 remove carpet and tackstrip.
Once this is done measure and cut out your pieces of laminate to make tread pieces riser pieces and stair nosing.
You need to take care of the treads risers and stair noses which can get a bit complicated at times.
However installing laminate flooring on your stairs is a completely different matter.
Laminate flooring installation on stairs.