First of you don't need to add 1, 2, 3 anywhere because the script does not use that.
You just need to install the plugin, enable it, add some font to /media/pcdtr/fonts/ dir and the edit the /media/pcdtr/css/style.css
check
how to add font
In there for your h1 h2 h3 just add:
h1, h2, h3 {
font-family: font name of the uploaded file to use;
font-size: 18px;
color: #fff;
}
For the menu write something like this:
#menu li a.level1 {
font-family: font name of the uploaded file to use;
font-size: 18px;
color: #fff;
text-transform:uppercase;
}
If you want a hover effect on it:
#menu li:hover a.level1 {
font-family: font name of the uploaded file to use;
font-size: 18px;
color: #000;
text-transform:uppercase;
}
Hope this help you for a starter.