Hi Scott,
To edit the series, you can click the Edit Series button link in the Work Orders List. From there you can change the Assigned To person, as well as any other setting. This will apply to all connected work orders. You can also click the Activities... button and select "Delete and Close" to delete the series of work orders.
One thing to note is that once a change is made to an individual Work Order (like by clicking Edit instead of Edit Series), this will break the connection to the series. So all changes made to the series will no longer happen to that Work Order as the association was broken. This is done to prevent any modifications made to one of the work orders in the series from being overwritten if the series is updated.
Hope this helps.
- Adam