How to find and delete a menu item in php?

I have a menu item that’s linked to its children in my html.

<div class="collapse navbar-  collapse  navbar-ex1-collapse"><ul id="menu"  class="menu"><li id="menu-item-  3530" class="menu-item menu-item-  type-post_type menu-item-object-  page  menu-item-has-children menu-item-  3530 dropdown"><a title="Contact"   href=" ct/">Contact  <ul role="menu" class=" dropdown-  menu"> 

Basically I want to remove the word contact I’ve tried with css, it doesn’t work. Where would i find this in my php and how would I remove that word. It keeps showing up in my contact page here top left in dropdown menu when it’s opened.