Navigate to Projects, select the ‘New Project’ button. You will need to give your project a name, this can be changed later. Add any relevant tags or description for your application or architecture, and hit Create. This will take you to the diagramming interface. Select the three ellipses next to the settings icon (top left), and then select ‘Model Questionnaire’.
To create the Model Questionnaire itself (if you haven’t already), head to the Configurable Options in the Documentation here.