[Plugin: Register Plus] Hiding and showing fields

Hello,

Great plugin. I want to change the registration form a bit. I want hide and show parts of it. This is what i had in mind.

this part is shown at the begining, after completing it, a button is activated and the user sees the second part of the form, the checkbuttons. Then after he checks one of the buttons, he goes on to the last part of the form, password and register button. I m thinking of just hiding and showing divs. I’m a little confused with how the plugin integrates with wordpress. I edited register-plus.php, tried to include a few divs in in but my changes didn’t show up on the register page. Any help would be great. Thank you.