Log in to your WordPress Admin Account
Hover your mouse on the Appearance menu found on the left side part of the page. Then click on Menus.
On the Edit Menus tab you will see the Pages and Menu Structure.
If you have recently just made a new page to your website, you might as well want to include that on your Main Menu. To do this, you just to need to locate that new page, tick its square button and hit the Add to Menu button.
You will find your newly added page at the bottom of the Menu Structure. To change the oder of a page, all you need to do is ‘drag and drop’ that page to where you want it to be.
If you need to remove a certain page from the Menu Structure, just click the arrow on the right of the item to reveal its options. You will find the Remove option there.
You would also just need to ‘drag and drop’ the item if you would want to re-arrange the order of the Menu Structure.
To finish everything up, all you need to do is click the Save Menu button on the lower right hand corner of the page.