I created a mailing list, sent a campaign, and now realized I missed adding an email address. I added it to the mailing list but now I'm not able to resend the campaign to that ONE address - instead it only allows me to send it to the whole list. Now, I did try to exclude the others by selecting the "exclude" area and selecting the titles of the previous campaigns - oddly enough it does remove some email address but it also removes the new one and leaves some of the others on the list that I've already sent the campaign to. Stumped! Please help.

Thanks. 
KR