Before your Transfer to ACD block you'll want to put a Find Queue block, like below

In the Find Queue block, in the Queue Name box type "Call.Contact." without the quotes then select the Queue option from the dropdown
add a name for the Queue variable
I don't have a Queue column in my contact list so ignore the Workflow Name above, this would say Queue in your flow.
Then in the Transfer to ACD block change the Queue to be an expression and use your queue variable from above

------------------------------
Cam Stone
------------------------------