“I cannot put blog posts there.”
Sure you can, @muhammads92. just go to dashboard, Posts > New and post your blog. And, if you do not have a “Blog” in your main navigation, just create a new Page named e.g. “Blog” or “News” and publish it. Then go to Settings > Reading and choose “Static frontpage” and choose what you want for front page in dropdown then choose “home” or “News” in dropdown for blog page and save.