I cannot find a solution in Joomla plugins. I need a login form what will use a preloaded database field for authentication. How do I do this using html in a Joomla 2.5 page?

I need a login form what will use a preloaded database field for authentication.

What do you mean by that?

I can't figure out how to migrate a cvs file into users in Joomla. Then, I need to automate the signin for those users. In other words, I need a way to migrate old users into a new Joomla site. Then, I want them to be able to signin automatically using the email field for authentication.