Here is the simplest method that I have found:
Add the plugin: Simple Google Adsense Insertion – One of the easiest methods to get your Google Adsense into your posts, pages and sidebars. There are many Adsense plugins, but I found this one to be the easiest. (installing plugins article)
In the “Adsense Ad Campaign 1 Code”, put in the code for a leaderboard from your Google Adsense account.
In the “Adsense Ad Campaign 2 Code”, put in the code for a 250×250 box.
Currently I am only using those two code boxes.
Now make one change to the 2nd campaign code (see below)
After “height:250px” put in (without quotes) “;float:left;margin:4px”. By adding that code, your ad will align left in the post and give it a little margin so the text of the post isn’t right on top of the ad. Scroll to the bottom of the page and click “Update Options”.
I noted down the 2 shortcodes for the ads. Go to a post that you would like to add the Google Adsense and click on “Edit”
Because we had already set the code for the 250×250 to align left with a 4px margin, we don’t have to do anything else with this code. With the leaderboard code, make sure you are on the visual edit section and highlight the code and center it.
Here’s what your post should now look like with the ads in place:
If you have any questions, leave me a comment. Thanks for reading.