Launch Aspire (if it's not already running). See:
To add a Python Bridge, a Python Bridge connection as well as a Python Bridge Vectorization component need to be added to the workflow.
In the Python Bridge Connection window, specify the connection information to the Saga Bridge.
In the Python Bridge Vectorization window, specify the vectorization information.
Once you've clicked on the Add button, it will take a moment for Aspire to download all the necessary components (the jar files) from the Maven repository and load them into Aspire. Once that's done, the publisher will appear in the Workflow Tree.
For details on using the Workflow section, please refer to the Workflow introduction.