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The shower kit should come with a pan and three walls. Set the pan away from the wall to give plenty of room to assemble the unit (Image 1). Lay the sidewall down flat, and bring in the back wall to attach them. The corner piece has a channel that the back will snap into with just a little bit of effort (Image 2). Once it's assembled, lift it into place to attach the third wall (Image 3). The center support railing attaches to all three walls, and keeps the shower upright. It also acts as a handrail and soap holder (Image 4).
Attach the railing to the wall with small bolts and nuts. Set the top rail and then attach it to the walls with pan head screws.
Have a shower tree ahead of time. It consists of hot and cold valves, and a pipe leading to the showerhead. Position the drain pipe over the floor drain in the basement.