Your text color has nothing to do with being voiced. To change your default colors that you see for your own text, press Alt-K. To change your font that you see, go to the Tools menu and choose Font. To change the color of text you send to others, press Ctrl-K and type the number of the color you want. Bold is Ctrl-B, Ctrl-U is underline, Ctrl-O will set text to original settings.
If you want to see if you are voiced, look in the nick list. Voiced users have a + in front of their nick. Ops have @ in front of theirs. Normal users have nothing in front of their nick. There are various other modes that different networks use as well, but that's not what you're asking about, so I won't start listing them. They aren't important for what you need anyhow.