Can't log into the Root Terminal or install anything.

I am using the Debian “squeeze” and have done nothing on it except change the time, date, and re-size my SD card.I cant seem to log into the root terminal.(I tried the password given on the download link) I was trying to change the username and the password for Pi. I also tried to install Adobe Flash Player and Google Chrome. I don't know about the compatibility between Debian and Google Chrome. The installion file for Google Chrome was able to download on to the computer but the Flash Player could not. There are multiple types of Flash and I tried all of them and it still did not download. Is there something I am doing wrong? Also it would be helpful if anyone could tell me how to change the username and password.
Please help and thank you.

The Pi doesn't yet do flash, although ISTR someone mentioned something about a plugin for chromium but that might be a figment of my imagination.

You can use sudo to do pretty much anything root user would do though

So is there anything that is like flash the Pi supports?

Since you can only log in as pi, you can't modify user pi when logged in as pi, but you can use your sudo priviliges to create a new user

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sudo adduser newusername

then it'll ask you for a password twice

Then you'll need to add it to the sudoers group with

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sudo visudo

Then copy the entry for pi changing it to your new id

then writeout (CTRL + O)
<enter>
CTRL + X to exit

Then make sure logging in with the new ID works and you have sudo powers.
Then you can remove the pi user if you want.

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sudo deluser pi

but if you want to remove the /home/pi directory you can use

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sudo deluser -remove-home pi

You'll have to go back into the sudoers file to remove pi as well.

Bit more info on the wiki http://elinux.org/RPi_Beginners#Create_ ... privileges

Here are the instructions to install the Chromium browser.
http://elinux.org/RPi_Chromium

You do not need to create a new user or be a root user to install software.