To create user Bob, open a console and type
<code>
sudo adduser Bob
</code>

"sudo" because you need to be system administrator ("root") to create new users.
"adduser" ...well, the name speaks for itself. There is also a command "useradd";
if you need more details enter "man adduser", "man useradd" (or in fact "man xxx",
substitute the command of your choice for xxx).
"Bob" is case sensitive like virtually everything in Unix|Linux|Knoppix.

useradd will ask you for a password for the new user, create a home directory (/home/Bob) and populate that directory with the contents of /etc/skel.