Sent invitations that have not been accepted, are listed under Pending Invitations at the bottom of the screen:
To resend the invitation to the same email address, select Resend Email.
To resend the invitation to a different email address, select Copy Invitation Link. The link will be copied onto your clipboard so that it can be pasted into an email or chat application. To paste the link, press Ctrl-V on your keyboard.
To void the invitation, select Delete. The link will no longer be functional.