Need some CSS help with my theme

Are you using a Browser Inspector tool like Firebug to find the correct CSS selectors?

I’m actually using Chrome, should I switch to FF?

Not if you are using Chrome, no.
What CSS have you tried?

Edit: Which is the title you want affected?

This is what I’m using to try to change the font:

/* fonts
————————————————–*/

@font-face {
font-family: ‘Libre Baskerville’;
font-style: normal;
font-weight: 400;
src: local(‘Libre Baskerville’), local(‘LibreBaskerville-Regular’), url(https://themes.googleusercontent.com/static/fonts/librebaskerville/v1/pR0sBQVcY0JZc_ciXjFsK5Rby8KfwQsaipLBqMCVNtM.woff) format(‘woff’);
}
@font-face {
font-family: ‘Libre Baskerville’;
font-style: normal;
font-weight: 700;
src: local(‘Libre Baskerville Bold’), local(‘LibreBaskerville-Bold’), url(https://themes.googleusercontent.com/static/fonts/librebaskerville/v1/kH7K4InNTm7mmOXXjrA5vz8SLKRGgamuUl1hIefMyNI.woff) format(‘woff’);
}
@font-face {
font-family: ‘Libre Baskerville’;
font-style: italic;
font-weight: 400;
src: local(‘Libre Baskerville Italic’), local(‘LibreBaskerville-Italic’), url(https://themes.googleusercontent.com/static/fonts/librebaskerville/v1/QHIOz1iKF3bIEzRdDFaf5dgliI79_bmRXH6crmREtCo.woff) format(‘woff’);
}

The one that I want affected is the big title that says OXOXTALIDOTCOM at the top.

Then you need to assign your fonts to that element. You’re missing the CSS to do this.
Look at this resource’s How Do I Use section.

Thank you!