Well, if you're changing small font to capital font in Microsoft word, use the CAPS LOCK key. Though, if you're talking about too many text, I'll suggest to highlight the whole text and right click...
For Picture Comments, it should have a little bar with the B for bold, I for italics. But. here are some: <b>Bold. <i> Italics. Or you can change your font size: <font size= number...
To change your font in myspace you put <font face="font you want goes here">
to change the color of your font you put <font color="the color you want">
to make your letters big you but...