Open your Campaign

In the Recipients view, click the + (plus button)

Search and Add recipients or Group

Select the checkbox for the relevant sending method

Select Send or Add for a Draft Campaign

Navigate to the Recipients menu

Select the checkboxes of the required recipients

Select the Plus icon (Add to campaign)

Select the Campaign. You can search for the Name or by those owned or shared with you. Select the eye icon for a preview of the poster

Select the checkboxes for the delivery method. The delivery checkboxes will not appear for Draft campaigns

Select Add to Campaign

A dialog will show all successfully added recipients and any that have failed. From here you can navigate to the campaign.