Each new page that you add in the Online Store can be addes as link in your menu on the header. To add page link as menu, make sure you already create a page. Next,
1. Go to wordpress > Menu > Appearance > Menus
2. You should see the new page that you have added in the Page column
3. Click on the page that you want to add in the menu
4. Next, click the button “Add to Menu”
5. You should see your recent added page in the menu structure
6. Next, click the button “Save Menu”
7. Go to your Online Store front page, you should see the newly add page link in the menu. In this case, the menu BLOG is appeared in the Menu.