You do have access to a database server, right? If so, here is some example code, based on MySQL that will build your table, you must be in MySQL to run this code:
CREATE TABLE dbUsers (
id INT NOT NULL AUTO_INCREMENT ,
username VARCHAR( 16 ) NOT NULL ,
password CHAR( 16 ) NOT NULL ,
email VARCHAR( 25 ) NOT NULL ,
PRIMARY KEY ( id ) ,
UNIQUE (
username
)
);
That should get you started.