Adding a new contract is simple. Click on the contracts Menu (the menu is located down the left hand of your screen). You will see a list of contracts currently defined in your account. Now click on the "New" Button (Located top right) and you will then be able to fill out the contract details. Finally click on the "Save" button to save your work. Take a look at this short video demonstrating how to Create a New Contract.
Next you can open the contract and add documents, people, companies to your newly created contract.