A The two sides of the drawer should be placed flat and aligned with the guide hole for balanced entry, as shown in picture. Al-Ada Drawer is for left side, B1-B4 Drawer is for the right side, please don't put in mistake! the installation of drawer is stuck, just dig the buckle as show in picture and then you can take out the drawer and put it again. Complete We genuinely appreciate your purchase of our product. Any problem (installation or damage caused by shipping), please feel free to contact us.