Is there a code (or short code) I can use to place an ad block on a specific page, in a specific spot?
This is within the page content and not in the sidebar. Thank you
Yes, you can use do it with Ad Tags. Just place the Ad Tags anywhere that you want ads to appear and AdPlugg will fill them with ads based on the rules that you define in your AdPlugg account. An Ad Tag is just an empty div tag that AdPlugg fills with ads. You can place them anywhere that you want ads including in your pages, posts, theme files, widgets, etc. They work much like a short code but are faster and more flexible.
FYI: The AdPlugg WordPress Widget is just a convenient way of dropping an Ad Tag into a widget area. You can do the same thing by pasting an Ad Tag into a Text Widget.
If the Ad Tag appears on multiple pages but you only want a particular ad (or group of ads) to appear on a subset of those pages, you can do it with Page Targeting (see here).