Just installed Mint Cinnamon and it's asking for a password

Hi, I searched first, but I might not have searched the right thing.

I did it!! There were little problems at each step, but I figured them out, so I’m super proud of myself. I’m not computer savvy!

When I step away and the computer sleeps, it asks for a password when I return, but I didn’t set one, so I have no idea what it is. The only way I have found around this is to restart the computer, which is not ideal each time I step away! Any advise?

Thank you!!