Select the name of the Y!group from the In Process list. That should take you to the status page.
Before you've given the "Go", the boxes there will still be enabled, and you'll have a button to update your request (select different items to transfer) if you want. Probably also one to cancel the transfer, and, when the transfer agent (believes it) has joined your group a button to initiate the data collection (I've been calling it the "Go" button, but I don't think it actually used that word). Anyway, after you've clicked that last button the checkboxes on that page will be disabled - your choices are locked in.
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If I click on the green ¡°Start New Transfer¡± I see boxes for a ¡°new¡± transfer.
Right. You only click that button once (per group being transferred, you can have more than one in process at a time). ?