You may click on the 'Add to intro queue' button found on the bottom part of the page. This button will allow you to add potential candidates to a queue and send the request at a later time when it's most convenient for you.

Once added, you may go to your Circles Dashboard, and you can view your Pending Intro requests.

You can select multiple or all potential candidates from this list by clicking the checkboxes and the 'Bulk Request' button.

Once the request is done, your Dashboard will show the updated data, and you can track the number of Intros you requested, Intros Made, etc.