Ah. Abuse. Thanks, guys.
Yes, I have watched a couple of the introductory videos. None seemed to make any sense, and you can"t read any of the text on the screen anyway. I believe videos are far less useful than text: I can speed-read, but you can"t do that with videos.
Sorry about the 'abuse' as you call it. Message to the posters - please maintain some level of decorum please.
Now, on to the brunt of the matter. Although the points raised by other repliers could have been phrased much more politely, the content remains valid. This is an early release of software, and the device itself it relatively slow, both these issues are well known. Let's see if I can be more specific...
Usename/Password. No different to Windows and/or Linux. SInce you have obviously connected to the internet this minimum level of security is vital, as without it you won't be 'the only user' for very long.
Boot the graphics: Not sure what you mean by this - is it 'startx' you refer to? Many users just want the 'command prompt' or text only interface, so that's how it boots. 'startx' is not difficult to remember if you want the graphical UI. Others versions of the software will probably boot straight to the desktop, as its not difficult to set up.
Display size: In order to cope with all sorts of TV's we need to underscan the HDMI output, as on some devices we were finding its was spilling over the edges. This is not a Raspi problem, it's a TV problem, and has been extensively covered in the troubleshooting section of the forum, and also on the Wiki.
Flash: Won't work, and without Adobe making it work, probably never will. This again is well documented.
Final point: It appears that you have bought a Raspi with very little knowledge of what it can and cannot do. Information that is readily available. This really is a case of caveat emptor. On the bright side, you can sell it for more than you bought it on Ebay, if you really don;t have the time or inclination to learn from it, which is it's primary purpose after all.
Principal Software Engineer at Raspberry Pi (Trading) Ltd.
Contrary to popular belief, humorous signatures are allowed. Here's an example...
“I own the world’s worst thesaurus. Not only is it awful, it’s awful."