Adsense – Add ‘adsense’ to my blog css attribut

How do I go and add adsense to my blog. My website is https://blog.littleman09z.net I have a couple of styles that users can choose from. Is there any way (i know there is) that i can do like <li id=adsense> bla blah and in the css it will have adsense aligned to the opposite side of the other stuff on my blog.
Any help is greatly appreciated.
Thanks