Change fonts not work

[CuestaJoker]

Hello, all the best...
I'm here to notice that the changes in fonts not work in editor and custom css, in custom css you see some changes, in dashboard but when you test in browser the changes doesn't work.
And have no information how put the custom classes in the field like:
Put classe with cooma ( , ) or semicolon ( ; ) and how works in custom css use like <style> etc...
In fact, have no way to font changes.
Sorry the plugin is very good, I'm in test with no option to use other font.
thanks in advanced