How do I install Indian language fonts to the "Fonts" section of the "Compose" part of the email writing?

I already have some Indian language fonts installed on to my computer

How do I install Indian language fonts to the "Fonts" section of the "Compose" part of the email writing?
Try control panel, internet options|fonts and choose your language type, this might not work as you have not specified the software you're using, so it much depends on the software, if it allow to choose other fonts than English, than yes, if not you have to do more research on that.