Using Custom Fields to Control Adsense Ad Placement
To use custom fields, you must first enable them on your site. Use the following process to do this:
A. On your site Dashboard, select Posts (pointer 1 below) and then All Posts (pointer 2).
B. Edit a post in which you have utilized, or plan to utilize, Adsense ads. This will open the WP Editor.
C. In the Editor, click on Screen Options (pointer 1 below) at the upper right. This will drop down the options box.
D. If the Custom Fields selection box (pointer 2 below), located in the "Show on screen" area, does not have a check mark, click on the box to select it.
E. Click on Screen Options again to hide the options box.
You have now enabled custom fields and are ready to use the Adsense keywords.