Do you mean a page that's the equivalent of a WordPress page, or do you just mean how do you post anything in Blogger? If you're talking about a WordPress-style page, then I don't think Blogger has anything like that. If you read their explanation on how to post a book (which would be a good candidate for pages instead of blog posts), you'll notice they don't have an easy way of doing it. If your question is just about normal posting, then read All about Blogger's post editor