Fonts & Font size

Is there a list of what fonts are available to use? I’ve tried changing the font to trebuchet-ms and it doesn’t work. Would be nice if instead of having to type in the font name, a dropbox with available fonts would be nice.

Is there a limit to the font size? I have set it to 16 or higher and it seems to go no higher than 12.

The page I need help with: [log in to see the link]