You can find detailed instructions on how to install aluminum stair railings by searching online. Typically, the first step is to measure the width of the stairway and then purchase a railing that is the appropriate size. The railing is typically installed using screws or nails, and in some cases it may be necessary to drill holes into the stairs in order to secure the railing in place.

There is no one-size-fits-all answer to this question, as the method of installation may vary depending on the specific railing system that you purchase. However, in general, aluminum stair railings are installed using either brackets or screws. If you are using brackets, then you will need to first attach the brackets to the wall or floor near the top and bottom of the stairs. Next, you will need to insert the railing posts into the brackets and then tighten the screws to secure them in place. If you are using screws, then you will need to first drill pilot holes into the wall or floor near the top and bottom of the stairs.