Under usernames what do I put?

What do I put under the missing info found part I followed the YouTube tutorial and go stuck at this part https://youtu.be/7UhKf_NN3OU?si=FPbSqPfbSQ_suAlK

This would be the username that you use to sign in on your Windows Computer. Default would be “Administrator”, but if you created multiple users, you would use the appropriate username. It also may be your Windows live account credentials.
For convenience, Remote.It will attempt to populate it into you Remote Desktop Application for the connection.
Please refer to Windows support for more.