T3v2 templates provide a main navigation (mainnav block type) which can be configured in the template manager, profiles tab. This tutorial will show you simple steps to load another built-in menu system.

1. Download the attachment file and extract into folder: templates/[your template]/blocks. We have a new block type name "topmega"
2. Open the file (topmega.php) and update your setting (Eg: change the menutype you want to show)
3. In template manager, edit the current layout to show the new block:
{code class="brush: html;"} ... ... {/code}