...You can log on as administrator (using the 'root' user) which should give you full admin rights and lets you do whatever you want, but it is not recommended -- that whole admin password deal is part of the reason Linux is vastly more secure out of the box than a windows machine is.
Unless you are not planning on connecting to the internet, you may find that you won't quite be 'the only person using it' if you don't have any password security...
Unless you are not planning on connecting to the internet, you may find that you won't quite be 'the only person using it' if you don't have any password security...