You've to be root to create accounts. An easy way to know if you are root or not, is to open a terminal and notice if your prompt is a hash (#) or a dollar symbol ($). Hash denotes root user, while dollar a non-root user:
You can become root by anytime by simply typing "su" at the terminal without the quotes. You will be prompted for the root password that you choose during installation process.
To add a new user, simply type, as root "useradd". You will be prompted for a couple of question for this user, including home directory, group and password. If later you wish to change any user password, including root, use the command "userpasswd".
Also, without being picky, but try making more descriptives threads in the future. "no" is a bad, bad thread title. "Help with root and managing users" would be 1.000.000x better and you will get quicker replies