Marianna

If it is one of the "browser safe" fonts(list) I believe you can just do this:

I'll use Tahoma for this example.

"Someday, I'm going to meet some supernatural creature who tells me everything I should know up front and in a forthright manner - but I'm not going to hold my breath." - Patricia Briggs (River Marked)

Here is what is going on in my HTML code:

If you want to use Google Fonts you need to add the bit of code they give you to your blog HTML.

I'll use Electrolize for this example.

First, I took this code Google Fonts gave me:

and put it right bellow the < head > tag in my Blog HTML:

Now it's possible to use Electrolize as a font-family:

"Someday, I'm going to meet some supernatural creature who tells me everything I should know up front and in a forthright manner - but I'm not going to hold my breath." - Patricia Briggs (River Marked)

Here's what's in the HTML:

Don't forget to capitalize the font name. 

I hope this is understandable. :)