Just find the relevant file in /etc/NetworkManager/system-connections
sudo vi
/etc/NetworkManager/system-connections/Wired\ connection\ 1
[802-3-ethernet]
duplex=full
mac-address=00:00:00:FE:FE:FE
[connection]
id=Wired connection 1
type=802-3-ethernet
timestamp=1532403341
[ipv6]
method=ignore
[ipv4]
method=manual
dns=192.168.1.1;
address1=192.168.1.89/24,192.168.1.1
edit, linux, nm, settings, guijust, relevant, etc, networkmanager, connections, sudo, vi, wired, ethernet, duplex, fe, timestamp, ipv, method, manual, dns,