You use the _installer_ code to set the _master_ code by entering (in normal run mode) Installer Code + 8 + 2 + 4-digit Master Code.
You set secondary user codes by entering (in normal run mode)
MASTER CODE + 8 + (user #3-6) + NEW CODE
You are jumping into programming most likely because you are trying to put a leading zero in front of the user numbers. On a V-10se there are no 2-digit user numbers. The command to go to program is [installer code] + 8 + 0.
Go here for an installer manual and delete/trash the SW 3000/Vista 20p manual you are trying to use.
http://ibsalbany.com/Burglar%20Alarm...ISTA10SEii.pdf