How can I access my dashboard?

To make the Form Workflow Plus application (dashboard) available to all requesters and reviewers in your domain, ask your G Suite admin to install the App from the G Suite Market Place:

https://gsuite.google.com/marketplace/app/form_workflow_plus/72896267429

All users in your domain will then be able to access the dashboard by clicking on the Form Workflow Plus icon under the grid menu in Gmail