Changing agent to myself

[Rick Sample]

In WF development / debugging, I have a task assigned to a different
user other than myself.
I want change the assignment to myself to continue working. The WF task
succeeded is in Ready state in
another users business workplace.
 
How do I change assignment to myself to continue? I don't want to hard
code my own name in all the
task to develop. I know I can do it, but don't know where in the
Admin.