OK, the transport unit on the rear can be accessed this way:
Turn it Off, unplug it from the power.
turn the printer around
push the open lever (A) to open the transport unit in the rear of the printer:
then you may have to stand the printer up on one side, while swinging open the transport unit:
and hold it firmly to prevent it falling over and breaking.
Then, remove the paper, more or less as shown:
pulling out the paper slowly and gently, and holding the printer firmly with the other hand.
If it is wrapped around rollers, try turning the roller to 'unspool' the wound-around paper, until you can grasp it firmly and completely and pull it slowly out.
Does this answer your question, and is the problem solved? let me know by Reply To Expert. I will help further as needed.