You can create a page by going to Dashboard/administrative back-end of your blog and clicking on Pages > Add New subtab. Writing a page is designed for static information that stands outside of the time specific flow of information that is the logic of posts. When writing a new page you can control the status, i.e., make the page a draft, password protected, etc. You can also control the order of pages so that they are aligned in the sidebar or in the header in a specific order.
As an option, you can add pages to your sidebar by going to Appearance >Widgets and adding the pages widget if it isn’t there already. Keep in mind that the widget allows you to control the display through three different means: name (alphabetically), order (which you control when creating a page), or page ID (which is usually aligned with when you created the post).