Vendor Contracts is not available in this version of OCTO Ops. The Coming soon badge on this page refers to the Vendor Contracts feature itself, not just to this guide — there is no Vendor Contracts list, form, or profile you can open in the application yet.
Agreements with customers are tracked on the Customer Contracts list instead. Vendor Contracts still appears in the left navigation under Contracts, but selecting it opens a page-not-found error.