c++ line editor

Have to write a program which is which is a line editor,using a dynamic singly linked list of String objects as the major data structure.
The program is a simple line oriented editor named LEDIT.
All lines in LEDIT can be any number of characters long.Below are the valid LEDIT commands:

IN - Insert(followed by text lines and terminated by "//"
DL - Delete
MV-Move(followed by a positive or negativew integer)
LA - List all
XT - Exit

Could someone please explain to me what this project entails,are
IN,DL,etc string objects.Is this just a string class which uses a linked list to dynamically allocate memory.Totally confused about this project.Could someone please explain this to me so I could possibly understand what project is asking for.Thank you.