Infrastructure Software

I have gotten linux running in a virtual box.

However, it wants as user name/password. I don't know what it is or how to set it up.

I did not see any opportunity to set up an account when I was installing it.

I tried various reasonable guess (like my oracle acct), but no luck

So how do I set this up? Is there some place in 'virtual box' to set up accounts. I'm running on my home machine, so no big need for security ...

-Traruh

PS. Is there a better forum for this question?