How do I reassign a process task?

Often you don't know who needs to be assigned a particular task until you start the process.

To enable this, you simply need to set the ASSIGN setting in the blueprint step to be 'Process starter':

Just before a process is started, you can edit the assignee by clicking on the 'process starter' name:

To re-assign after the process has started:

Here is a video walking you through task assignment: