You can create your own blog for your website by following the steps below.
Step 1: Login to your WordPress website
Step 2: Select "posts"
Step 3: Select "add new"
Step 4: Add a title
Step 5: Add the category "blog" or check the box next to "blog"
Step 6: Set a featured image for the post
Step 7: Select "add widget" at the bottom of the page to add content for the post
Step 8: Select "publish" when finished
Note: Do not put content in the top text box. If you add content here it will not show on the page.
Now that you have created a blog post, you can then attach it to your menu.
Step 9: Select "appearances"
Step 10: Select "menus"
Step 11: Select "categories"
Step 12: Select "view all"
Step 13: Check the box next to "blog"
Step 14: Select "add to menu"
Step 15: Select "save menu" to save your changes
Your blog posts will now show up on one page and be displayed in the menu of your website.