You have to ensure that there are no gaps and spaces in the flooring and it is complete and perfect in every way.
How to install laminated flooring on stairs.
Alternatively you could cover the overhang with plywood to make it level.
Push the riser into place.
Cut enough pieces for each stair with the shape of the top of the stair.
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.
Things i mention in this vid.
Laminate flooring installation on stairs.
For installing a painted wood riser or laminate flooring riser use a good construction adhesive.
Put a line of adhesive across the top the middle and the bottom on the back of the riser not too close to the edges.
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.
Woodwise stair jig scribe http amzn to 2swvftk subscribe for more.
Cut the nose of the laminate to cover the exposed grooves and threading on your laminate for each stair.