HELP! How to Add subpages to my website?

I have a custom wordpress theme that I am using for my static website. I now have to create the subpages for the site. I know how to create additional pages, but I do not know how to link these sub-pages to the button/link on the homepage so that the site is operational. For instance, I have created my “Terms and Conditions” page, but I dont know how to link it to the homepage, so that when someone clicks on “Terms and Conditions” it will take them to the subpage I have created. Does anyone have any advice on this matter? Thanks.