With some models you'll have to pre-order the door to open to the left or right, as it won't be reversible. Some models have reversible doors, and although you may be able to do this yourself, manufacturers recommend getting a service call. Reversible doors are useful if you move house and/or need to reposition the fridge.
R Opens to the right only (ie hinge is on the right).
R or L Can be pre-ordered to open to the right or left .