You can easily customize menu with the following steps:
Dashboard> Appearance> Menus
Give Menu Name (let’s say menu) and click on Create Menu.
Create a home page of the website, for that, Go to link tab, give Link Text and URL.
Click on Add to Menu. The home page is added now and listed in the menu.
Similarly, to add other pages to the menu go to Pages option, Check off all the pages and click on Add to Menu.
Now these pages will move to the Menu Structure area. Here, you can rearrange the options sequentially by drag and drop action.
Finally, click on Save Menu button.