You should change the Admin password, I think admin permission couldn't change.
may be the bellow text will be helpful:
Setup Secure Shell (SSH) Service
1. Add the admin user to the wheel group:
# usermod -G wheel admin
2. Edit the server’s SSH configuration file:
# nano -w /etc/ssh/sshd_config
3. To allow only SSH protocol 2 connections, find the line:
#Protocol 2, 1
4. Uncomment it and change it to:
Protocol 2
5. Next, to disable direct root login, find the line:
#PermitRootLogin yes
6. Uncomment it and change it to:
PermitRootLogin no
7. Next, to change the port that SSH listens on, find the line:
#Port 22
8. Uncomment it and change it to:
Port 1022
9. Save the file and exit the editor.
10. Restart the SSH service:
# service sshd restart
Change the Server Admin Username
1. Change the admin username:
# cd /usr/local/directadmin/scripts
# ./change_username.sh admin newuser
Note: Replace ‘newuser’ with the username you wish to use for the admin account.
2. Edit the server’s SSH configuration file:
# nano -w /etc/ssh/sshd_config
3. Find the line:
AllowUsers admin
4. Change it to:
AllowUsers newuser
5. Save the file and exit the editor.
6. Restart the SSH service:
# service sshd restart
7. Edit the DirectAdmin list of allowed admins file:
# nano -w /usr/local/directadmin/data/admin/admin.list
8. Change the line with the admin username to the new username for the admin account.
9. Save the file and exit the editor.