I desperately want to add 350x350 ads unit in my blog, that is between the first and second post but i dont know the code to use for it. Please, who can help me. my blog url is www.believeall.com
I'm not up on how blogger themes work but I'm sure someone here can help you. Are you using a standard theme?
depends how you setup to display your blog. if you display your posts with loop, you can use a counter to control where do you want to show the AD.