Header
Logo
Logo at Argento Marketplace is on the left side of the header. You can change logo using default Magento intefaces. Check this article to find out how to update store logo.
Menu
Menu is under the header at Argento Marketplace. Menu is powered by Navigation Pro module. This module has a lot of great features. Read its docs to find out more details.
The Argento Marketplace menu is displayed in opened state on homepage with Expanded on Homepage feature.
Menu identifier is argento_marketplace_topmenu.
Top Search
Search you can see in the middle of the header.
Search functionality is powered by Ajax Search module. Check module docs to see what features it has.