The repeated “Appear on just 1 page”.

Hi, I see back when the plugin was new people were asking about this and it was a planned feature in v 1.5. I have version 2.0 I believe and I do not see any way to just have it show on one page. As late as 2 months and 3 weeks ago you had the same basic question. Is there a way in the plugin to have it appear on just 1 page? If so, where the heck is the setting? IF not, I see this stuff here about the code. Where do you put that or modify it?