Step 1:- Login into WordPress dashboard using id & password. This is how the dashboard looks like go to appearnce
Step 2:- click on menus and here you can add or delete any menu you want
Step 3:- we have created a new page as center for the arts we will that page to main menu now
Step 4 :- our page have been added to the menu as you can see now click on save menu to publish our new menu
And that's how you can update the menu using wordpress