Until todays update only Law Firm and Agent users could create and issue contracts in OPEX - now we're giving you the option to let "Developer" users to create and issue contracts on projects specified by you.
To allow Developer users to issue contracts for a project:
Navigate to the Project
Go to "Project Settings > Options" and click edit
Find the option called "Allow Developer users to create and issue contracts" and select it
Click "Save"
Now your Developer users will have a "New Contract" button on the dashboard of that project. Note as Developer users can only create contracts for projects that you specify, they must do so from the project dashboard - not from the "Project Contracts" list screen.