Nail the boards into place with finishing nails.
How to install wood laminate flooring on stairs.
However installing laminate flooring on your stairs is a completely different matter.
To install laminate flooring on stairs start by removing the overhang or the underside of the stairs with a jigsaw.
Alternatively you could cover the overhang with plywood to make it level.
Cut the flooring boards to size using a circular saw.
You have to ensure that there are no gaps and spaces in the flooring and it is complete and perfect in every way.
Once this is done measure and cut out your pieces of laminate to make tread pieces riser pieces and stair nosing.