what is the code for my second ad

AdPlugg doesn't generally provide a tag/code for each ad. If you want different ads to appear in different places, you create Zones. A Zone is a place where an ad can appear. You place the Zone code/tag on your site where you want the ads to appear, then you target your Ad to the Zone and the Ad will start displaying there.

If you want all of your ads to appear together (for instance in a column down your sidebar), you can skip Zones and just use an Ad Tag (or WordPress Widget) that doesn't specify a Zone.