Processes are generally started using a business service/page-flow concept in TIBCO AMX BPM. A page flow is nothing but a simple 1 or more page web application that internally spwans your business process instance.

In case you do not want to use page flow processes and would like to directly start the business process, you need to make use of the 'Start Process Instance' button that is available in TIBCO AMX BPM workspace.

The button is not visible by default in workspace. You need to enable 'Start Process Instance' button by changing some user configuratin settings.

Once the button is enabled for the logged-in user, the button is visible on the top left corner of the workspace window:

Steps to Start a Process Instance Without using Page Flow or Business Service:

1. Click on the Start Process Instance button. Select 'Open' option.
   
2. The Start Process Instance dialog is displayed:
   
3. Select the process that you want to initiate and Click 'Start' button to start an instance of the selected process.

That's it. You are done. You can see the process instance in the desired work list.