You can find this section in HostBill Admin → Clients → Manage Clients → Client Profile → Contracts
To add a new contract click on a blue "New Contract" button. You can also edit existing contract by configuring the fields:
Signing a contract by a client is one of the steps available in Order Scenarios - this is where you can decide whether this step should be included in your ordering process.
Assigning or changing existing contract to the client is available in Client profile (section: Contracts) and in Account details → More Actions → Change Contract.
There is a Contracts Client Function which enables clients to display related contracts.