how can i add a field date birth date

i have a birthday module, this module...

Author
Sultan El Turrah http://www.theclubbing.com Sur base du travail de Lmaix http://www.bahut.com

...this module make a tables in data base

#
# Structure de la table `users_birthday`
#
CREATE TABLE users_birthday (
uid int(11) NOT NULL default '0',
jour char(2) NOT NULL default '',
mois char(2) NOT NULL default '',
annee varchar(4) NOT NULL default '',
PRIMARY KEY `uid`(`uid`)
) TYPE=MyISAM;

The birthday date was add from the module...
how add a field in profile module for can add datas in tables of users birthday from registrer profile module.


i have the usermanagement 0.1 version module

thanks