Add a New Menu Item - Jan Allegretti, D.Vet. Hom. || Listen to the Silence

From the Main Menu, click Appearance – Menus.
On the Menus screen, if it’s not already active, click the Main Menu tab, top-center.
To add an internal link (a page on your website) to the menu, scroll down to the Pages box, on the left-side of the screen. Click the checkbox next to the page and click the Add to Menu button.
TIP: Menu items can be dragged into order. Drag a menu item to the bottom edge of another menu item to create a drop-down menu item.
To add an external link (a page on someone else’s website) to the menu, scroll down to the Custom Links box, on the left-side of the screen. Enter the link url and the menu item title and click the Add to Menu button.