Hello Sulthan,
Which step do you have question about "How" ? The authentication command?
Change the command in AN as below :
nxpdebugmbox -i jlink start
nxpdebugmbox -i jlink -p 1.0 auth -b 0 -c keys\dck_rsa_2048.dc -k keys\dck_rsa_2048.pem
And pay attention, the SPSDK updated to new version, so if you refer to this AN , about the files under AN folder, not suitable, please download new example files in https://github.com/NXPmicro/spsdk/tree/master/examples/dat
BR
Alice