Yes, you can remove the water filter housing to access the water lines. Here are some steps that should help you access and change the water lines on the back of the water filter housing:
Unplug the refrigerator to completely disconnect electrical power. Turn off the water supply to the refrigerator.
Remove the water filter from the filter housing.
Remove the screw that secures the front of the filter housing to the roof of the refrigerator.
Remove the front part of the housing from the back portion that the filter screws into. There are some catches on the back part that hold the front part in place. Release these catches to remove the front part of the housing.
The back portion of the water filter housing is attached to the roof of the refrigerator compartment with a peg protruding from the roof. Carefully release the back portion of the housing from this peg. It will slide off.
The water lines are attached to the back of the filter housing with John Guess fittings. To release the water line that you are replacing, push and hold the gray collar of the fitting in while pulling the water line out of the fitting. The new line will simply push into the fitting. Give the new water line a slight tug to make sure that it is properly seated in the fitting.
Replace the water line and reassemble the housing in reverse order.
If you need more help with this repair, resubmit your question with additional details.