Change the number of posts displayed on your blog
To change the number of posts displayed on your blog, go to your Layout tab and click "Edit" on the blog post widget.
A window will then pop up with options to change your settings. The first option should be "Number of posts on main page" -- you can adjust that number accordingly, or change the setting to reflect the number of posts, or number of days with posts.
The overall page size is limited to 1 MB, so if you try to list hundreds of large posts all on your front page, you may get a publishing error. Lowering the number of posts displayed should fix this.