Hi,
Easy Profile extends Joomla registration page (not replace), the tabs are generated by Javascript. You can disable this option from Easy Profile options.

You can also remove tabs (with option enabled) or fieldset title (with option disabled) with simple CSS code.

If you have any problem please post me your site link. We can help you.

Tks for help

when disable javascript in option from Easy Profile, I have this result.

Ok,
you can hide this by adding simple CSS line to your template like:

#member-registration legend,#member-profile legend{display:none}