Step 1 : In the WordPress admin panel navigate to  Plugins > Add New, then search for WC Vendors Marketplace. Click Install Now.

Step 2 : Once the plugin has been installed, you need to activate it. Click Active and activate the WC Vendors Marketplace plugin.

Step 3 : After WC Vendors Marketplace has been activated, you will see a new WC Vendors Menu item in your WordPress Admin menu.
Click Run the Setup Wizard to begin setting up the plugin.

For more information, please visit there site.