Hello,
Check the documentation of the vendor plugin. If you mean WCFM – WooCommerce Multivendor Marketplace plugin – https://wclovers.com/knowledgebase/wcfm-marketplace-vendor-registration/ , read more https://wclovers.com/knowledgebase_category/wcfm-marketplace/ Check forum on the plugin – http://prntscr.com/10xvhqo https://wordpress.org/support/plugin/wc-multivendor-marketplace/
Regards
