Changing fonts to Squirrel fonts

Hello!
Could you help me with changing fonts for this theme? The question is: how to change the font to Squirrel fonts?
I've uploaded Squirrel kit fonts (the name of the font is "MyFont", as an example) to "...themes/Startup/fonts/MyFont"
Than I've changed the font in panel (StartUp->Template Options->Fonts->...): Body->Fonts Squirrel / Fonts Squirrel->MyFont. Same font sets for Headers.
But it seems that the template can't see MyFont and it uses standart font.
What did I do wrong? Should I make any changes in override.css file (for example, to define font pass there)?

Thanks a lot in advance!

I've added stylesheet.css file to the folder StartUp/fonts/MyFont with the following css code:
@font-face {
font-family: 'MyFont';
src: url('MyFont.eot');
src: url('MyFont.eot?#iefix') format('embedded-opentype'),
url('MyFont.woff') format('woff'),
url('MyFont.ttf') format('truetype'),
url('MyFont.svg#MyFont') format('svg');
font-weight: normal;
font-style: normal;
}

But it haven't helped.

Also I've tried to change fonts to preinstalled Squirrel fonts: gavrenwp and Colaborate in admin panel (startup->template options->fonts): the template does not see these fonts. Instead it uses "MS serif" font.

The problem solved
I've used Latin font for Cyrillic letters, so apparently the template didn't see cyrillic letters in Latin font
I thought I was using Cyrillic one...
Sorry

Hi

Ok. Great to hear it's solved. Sorry I could not get faster to this to help.