How to add a page to inner page

I am not a web deigner or developer. I need a very simple step by step instructions, such as this:

Updated instructions to edit the main menu:
1. from the Dashboard click Appearance
2. click Menus
3. in the Pages box (left) click View All and find the page you wish to link to in the Menu
4. Check the page(s) and click the Add to Menu button
5. The pages should appear at the bottom of the menu (in the Menu Structure box)
6. Scroll down to see this, you can then drag and drop these items to rearrange the order, when you’re finished click the blue “Save Menu” button

https://wordpress.org/plugins/inner-page-menu/