Wordpress - Horizontal Submenu, Contact Us forms

We have already site developed in WORDPRESS. 1) Need Horizontal Submenu navigation instead of default vertical menu ( includes child submenu ) many submenu levels included. Please refer attached screenshot. Also respective button should be highlighted. i.e. if about us page is option , it should highlight about us button. 2) Required contact us form included in POST Basically we have a few competition posts and a few projects post. Where we accept registration from contestants. Only logged in users can fill the form. Please refer attached document for the same. * You can use ready plugin but should be standard and listed in [login to view URL] plugin database *Validation for the forms is must *Error should not come on next page on same page or using AJAX * After login Succesful registration message and one welcome mail to admin and user should go *After registration user should to return back to same page * Need short code / php code insertion if possible so we can reuse the code in new form Terms - 1) You should not put or make changes on site other than given requirements i.e. no footer, redesigned links etc 2) Should not include the site name in your profile, or freelancer profile 3) site name will be provided only in Private messages