After creating your campaign, you will be brought to the campaign detail page. If you navigate away from the campaign detail page, you can return to it from the "Campaigns" tab grid. Once you are in the campaign detail screen, you can start to send your requests to accrual managers.
In order to send campaign emails requesting accrual estimates, you can click on the send request icon at the right side of the grid by every vendor.
Or you can bulk send to contacts using the "Bulk Action" button at the top of the page.