Here you can use the same alphabet for coding and decoding, so it saves you some writing!

A stands for N, and N stands for A
B stands for O, and O stands for B
C stands for P, and P stands for C
and so on.

Just write out the letters from A to M, and write the letters from N to Z directly below them.

A B C D E F G H I J K L M
N O P Q R S T U V W X Y Z
 

Example:

SCOUT = FPBHG

Here's a code for you to solve:

QB LBHE ORFG