Lets assume below is the screen which you get by default . In below example its linux-vm user . what if you want login with other user ?
As showed in below screen press down arrow to go to other tab . And then press enter key .
You will get below screen .
Then enter your user name . In below screen i am logging as user "root". Then press enter key .
Then it will prompt for password .
Give your password accordingly . If your not sure about password check here on How to change password.
Ignore the below error and close it .
Now you can see below your able to login the server.
Then you can do right click and enter open in terminal as showned below .
Below you can see the terminal was opened .
Please do comment below for any queries , will get back to you soon .