Pass additional fields?

Hello,

Thanks for such great plugin however i’d like to ask you a question, i just spent more than an hour and i can’t figure it out, is there any way to add an additional field to the registration form and save it into the usermeta ? I’ve been able to add fields by investigating the actions available into the code of the plugin however i can’t figure out how to save the value on submission.

Have you got any suggestion?

Thank you.

http://ww.wp.xz.cn/plugins/wp-modal-login/