How to change user Adonix service

SOLVED

Hello every body

I have a old version of Adonix ==> v140 in a windows 2003.

I must put this server in workgroup for security.

But the problem is that adonix service user is an AD account.

How can I change this user??

I tried to change but impossible. When I saved in the console, the user with the domain reapper.

Thank you for your help

Fred