to get into console press ctrl+alt+f1.
then, log in to the pi.
then, type ifconfig
this should show you the interfaces and the IP address of the Pi.
if you control the network at your office or can get a network admin to tell you, it might be easier to control it from the DHCP server by adding the MAC address of the Pi to the DHCP reservation.
if you still want to control the IP manually, you would need to modify the dhcpcd config file:
sudo /etc/dhcpcd.conf and edit the part pointed by you, deleted # from “interface eth0” to “static domain_name…” and change IPs…but is still on dhcp after reboot, amin same IP as before I edited. What am I doing wrong?
…and you are still not getting your static IP, this is kind of out of the scope of help because your network is unknown, dhcp/router/etc., you can’t just tell a device to use a static IP if there is a dhcp server broadcasting on the subnet and then your Pi trying to assign itself a static ip that might not even be outside of the dhcp server distribution list…
why dont you just reserve the IP you want for the Pi on your router and be done with it… might be easier than messing with the dhcpcd…