Replace left to right if you want to show ads on the right side wrapped with text. Note: Observe that all of the above codes are added between conditional tags which will show ads only on post pages neither on homepage nor on labels page. If you want to show ads on every page then remove those conditional tags.
If you are showing ad on homepage and label pages also then take a look on your ad. It will be shown below all post’s titles means if you have set 5 posts to appear on your homepage then it will only appear below first 3 post’s titles. Last two will be shown as blank white space. I recommend you to show ad below first post title only. Replace above conditional tags with below ones to show single ad on homepage and labels page below first top most post’s title.