Changing Header Font

I’m trying to use Acorn font (which I’ve downloaded onto my computer) for the header of my Minimatica-themed site.

I’ve followed the instructions on the following thread:
http://ww.wp.xz.cn/support/topic/change-theme-font-1?replies=42&view=all#post-3074744

I’ve downloaded the font and also accomplished the following:
✔ Unzip the files.
✔ Open stylesheet.css (with notepad is just fine).
✔ Copy all contents.
✔ Go to Admin panel, Appearance > Custom Style
✔ Paste in Custom Style

Now I’m stuck at the step: “wp-content/themes/yourThemeName/ directory
Then create a new folder called ‘fonts’.
Move the fonts from the Font Squirrel zip file (you unzipped earlier), into this ‘fonts’ folder”.

Where do I find this? Thank you.

I just want to change the font of the header to Acorn. (http://www.dafont.com/acorn.font?text=Museum&psize=l)

Please help.