Change font

I read in previous thread that people have difficulties to change fonts.

I tried to use Squirrel fonts but everytime i set this, setting go away when i save. I dont know if this is because i have å,ä,ö characters.

If i use Google fonts i can only get "Headers - selectors" to work if i set h1, h2 and so on (see image).
Must i do so? Cant i just set "Headers - font"? What to type in "Body - selectors" in that case?

I cant find any solution in forum or in doc.

222.png

I dont know if im stupid but i dont understand how noobs would understand what to input here. No forums thread or doc about this.

Anyway, i added span.menu-title in "Body - selectors" and the menu title change font. Squirrel font issue is still there, can only use Google fonts.