I am using the following link :https://thepi.io/how-to-use-your-raspberry-pi-as-a-wireless-access-point/ to set up my raspberry pi to act like a wireless router. So far I have installed raspbian on a sd card. I don't have access to an external monitor or a keyboard. I have access to a ubuntu laptop. I want to use the commands on the tutorial to set up the pi but how do I connect to pi in the first place. This is the first time I am doing this and I have no idea. I have an ethernet cable and wifi access that is again provided by a raspberry pi that was already set up by somebody else. How can I connect to the raspberry pi in the terminal to execute the commands? Thanks!
SSH is what your looking for. If you plug you RPI ethernet to your router you can use
arp -a (linux, mac) to see all IP addresses on your network. You will likely see your pi as
pi (192.168.1.15) or something along those lines.
Once you find the pi IP you will enter. It will prompt you for a password, it is usually
raspberry on raspbian OS.
If this doesnt work. SSH might not be enabled. You can take your SD card and put create an empty file with the name SSH at the boot directory.