Fanny,
I think I understand the problem. These stairs cannot be recolored to show the words correctly because they are not mapped to allow it.
These stairs are modular so the game puts each step of these stairs down separately and while all of the steps use the same texture map, the texture is put on each step differently as the game "builds" the staircase.
I think you will have to find a staircase mesh (not modular stairs) that is mapped to display the texture on each step identically in order to get the look that you want.
This is Steffor's
Fresh staircase, which would work- unfortunately it has no railings:
Mustluvcatz @ MTS made three styles of
stair railings, so I think those could be used with these stairs. Her stairs can't be used because the edge of the step is mapped so that the writing goes across it and looks terrible.
They would not be modular, but I don't know of any modular stairs that would work.