Rp Tutorials

this may be a rather foolish question but i have to ask it anyway, does anyone know how to get the font in the header to appear/link to the correct links like in this journal? i know how to pull the coding for the layout but can not for the life of me figure out how to get that part to appear/work

i was just wondering how do you upload google fonts so they actually appear for you. i haven't done it in such a long time and completely forgot the site. i also wasn't sure how to change the font in the subject line of my journal like over here.