To fix the glass panels that are positioned either side of the door in place you need to use the 'S' plate, which is a piece of metal with a hole in one end (see image below) Or alternatively, some showers have a plastic retaining piece, that does the same thing.

1: Place the clear seal over the end of the glass and push into the frame fully.

2: With the glass in place, position one 'S' plate (or plastic retaining piece), so that it hold the glass in place against the inside of the metal curved frame section.

3: using the drill bit supplied, drill a small hole through the first layer of the frame. DO NOT DRILL THROUGH THE OUTER SKIN OF THE FRAME.

4: Using one of the smallest screws supplied, fix the plate to the inside of the frame.

5: repeat this for the lower and upper frame on both glass panels.