The Admin menu is where Admin Users of your Vendr account can go to edit account settings.
You'll find the menu in the lower left-hand corner of your browser window.
There are 6 pages in the Admin section (each of which has a dedicated help article):
Organization - A couple general account settings
User access - Manage user access to your Vendr account
Properties - Manage Custom Properties for Products, People, & Contracts
Transactions - Manage Transactions
Integrations - Manage Integrations
SSO - Configure SSO Login
API keys - Create/Delete API Keys