You or your site administrator can define subscriptions to associate documents, folders, or forms with a workflow definition for manual launch. When you access the information page for the object, you can select the Launch action to display the list of subscriptions that you can launch a work item for. The items listed depend on the subscription settings.
Subscriptions can be defined for a document class, a folder class, or a custom object class. The subscription settings determine how many objects are displayed in the Launch page. If there are no subscriptions defined, then nothing is listed, and you cannot launch the workflow.
To launch from a subscription: