All you have to do is add some HTML to a text widget and drag it to your sidebar. You can do so from Appearance > Widgets in your admin area.
Here’s the whole HTML you need to use:
<ul class="nav menu">
<li class="item-274"><a href="/index.php/sub-rediframe-menu.html">Rediframe Fixed Throat Steel Door Frame</a></li><li class="item-275"><a href="/index.php/rediflex-adjustable-throat-steel-door-frame.html">Rediflex Adjustable Throat Steel Door Frame</a></li><li class="item-276"><a href="/index.php/rediframe-hollow-metal-masonry-and-drywall-door-frame-non-kerf-and-kerf-2.html">Rediframe Hollow Metal Masonry and Drywall Door Frame (Non-Kerf and Kerf)</a></li><li class="item-277"><a href="/index.php/kerf-rediflex-adjustable-throat-steel-door-frame.html">Kerf Rediflex Adjustable Throat Steel Door Frame</a></li><li class="item-278"><a href="/index.php/kerf-rediframe-fixed-throat-steel-door-frame.html">Kerf Rediframe Fixed Throat Steel Door Frame</a></li><li class="item-279"><a href="/index.php/borrowed-lites-sidelites.html">Borrowed Lites & Sidelites</a></li><li class="item-280"><a href="/index.php/casings-options.html">Casings Options</a></li></ul>