Assigning Role Back to User in BPM

Hi all,

I have a bpm scenario in which workflow want to be generated in the following way.
In pool level i have two lanes.In Lane 1 i set the actor as admin,where i defined the form,when the user enters the form and click on the Assign option the following data want to assign to the other actor ie., james in lane 2.

Now Lane 2 Actor receives the form.In Lane 2 there are 2 submit options, when the user enters the back to admin option the data need to move back to the admin.I am failing to send back the data to the admin.Some one help me to resolve my issue.

Thanks in Advance,
Avinash