[Help] Unable to create new page – it always auto-populates in navigational menu

When I go to Pages >> Add new , creating a new page will automatically display as part of the navigation theme menu.

Can someone help me create a new page within WordPress, wherein I click on a link within my post, and it will bring me to that new page I created (rather than having that new page display as part of the navigational menu)?

Thanks in advance,

-kat