Try looking in the style fodler for that theme. IN there is the style.css file.
Open it in Notepad(prefer using program that won't change the coding layout like EditPlus or UltraEdit)
Look for Font Size = "11" or whatever througout the file. You may see this
Code:
.boxcontent {BACKGROUND: none; COLOR: #DCDCDC; FONT-SIZE: 10px; FONT-FAMILY: Verdana, Helvetica}
or similar lines. Change the FONT SIZE to a higher number, say 11 to 12. You will have to play with this a little while to figure out which one controls the News POsting text size.
mikem