You’ll pretty much always see a MAC address, and depending on your router manufacturer, you may also see an IP address, a device name, or other information. You’ll know you’ve found the right place when you see a list of currently connected devices that probably give you an option to see logs of past activity as well. The logs may also be hidden behind a button or menu that shows you information about DHCP clients. Once you’re in, look around for an option called “Connected Devices,” “Local Network,” “WLAN,” or anything that looks as if it might give you information about your network. (Changing it is a smart move since most routers come with default settings like “admin” and “password.”)
After that, you’ll need to log in to the router using either the default information printed on the device or whatever you changed it to.