You can find a option that lets you format the text you want to type. There would also be an option that would enable you to change the fonts as per your requirement. After you have done soo , you can type your text and verify if you have done the right thing.
Take MSN for example, to change the font:
1. Open menu Tools->Options
2. Click Message in the popup dialog
3. Click 'Change Font' button, then choose the new font, click OK. In this way, the font of MSN will be changed