STEP 1: sign in then choose Appearance > Menus
STEP 2: Then (on the right of the screen) select the correct menu tab for the menu you wish to change
STEP 3: To remove a menu item, click to expand its panel in the menu area, and then click the ‘Remove’ link
STEP 4 a: To add a menu item for a page on your site, in the Pages panel (on the left), click to tick the page, then press the ‘Add to menu’ button – it will be added at the end of the menu to begin with
STEP 4 b: To add a menu item for a web page somewhere else, in the Custom Links panel on the left, paste the url of the web page, type a short label for it, then press the ‘Add to menu’ button – it will be added at the end of the menu to begin with. If you want to make a menu item just to be a menu sub-category heading type # in the URL field, and the category heading in the label field.
STEP 5: To reorder menu items, click and then drag-and-drop item panels up and down the menu area. Dragging to the right allows you to inset menu items as ‘children’ of other menu items.
STEP 6: Click the Save Menu button to finish, and view a page which uses it to test new links