A terminal will appear, and you can log in using your Pi's credentials—by default, "pi" is the username and "raspberry" is the password, but this may vary depending on the image you downloaded
How to Enable Password-less Login on Raspberry Pi The default login for Raspbian is: username: pi; password: raspberry; Login with the info provided above. (if you haven’t already) Change your password. using the passwd command you can change the password for the pi user. you may need to run the command with superuser permissions: sudo passwd An example output is below: How to Reset Forgotten Raspberry Pi Password: Recover Recover Raspberry Pi Password. To reset Raspberry Pi password, you will need first to shut down the Raspberry Pi device. Physical access to the SD memory card is required to complete the process for resetting the credentials when you forgot Raspberry Pi login details. Things needed.
The Raspbian Wheezy/Jessie default login is user “pi” with password “raspberry“. If you have not already changed your password, you should do this now because not only you but also everybody else in your network could have remote access to your Raspberry Pi (if the default password is known).
Raspberry Pi Default Username and Password - Howchoo
Raspberry Pi System Logging and Loggly
Aug 31, 2014 Enable root login and change password - RaspberryPi - VMLinux Oct 11, 2016 How to lock your Raspberry Pi Screen– The Pi Hut