This FAQ will guide you on how to transfer a lead to a queue.
While on a call, click Transfer button to open the Transfer Conference Functions window.
In Transfer Conference Functions click on the Queues tab. 
To turn on continue recording, please put a check on the Record Transfer Call option before transferring the call.
Click the Arrow button in the far right end row of the queue to transfer the call to it. The call will hang up as soon as you click the arrow button to transfer the call to the queue.
Note: If there are mandatory fields that needs to have information, you will see this message