When choosing fonts in FX Online, you will find that many fonts on your computer will not be available to use in FX Online. You will usually only have the choice of seven fonts.
This font restriction is due to the limited number of fonts that can reliably be rendered on all devices. If we allowed you to choose a more obscure font, you would find that your web lesson would not render as you intended. Keeping to these seven fonts makes your pages more reliable and much faster to load.